Laptop Hot in Bag, Draining or Restarting? Fix Modern Standby (Always On, Always Connected)

Most modern Windows laptops use Modern Standby, once called Always On, Always Connected, a phone-like sleep in which the PC stays partly awake to receive email, updates and notifications. When it misbehaves, the laptop wakes in your bag, comes out hot, drains its battery overnight, or shuts down or restarts unexpectedly. To diagnose it, run powercfg /a to confirm your PC uses Modern Standby (S0 Low Power Idle), then powercfg /sleepstudy to see what kept it awake, and check Event Viewer for Kernel-Power event 41 after unexpected shutdowns. The fixes that help most are installing the latest Windows, BIOS and driver updates, setting the laptop to hibernate after a short time asleep or when the lid closes, limiting network connectivity in standby, and stopping scheduled maintenance from waking the PC. In June 2020, Microsoft's update KB4557957 fixed a bug that made some Always Connected PCs on Windows 10 version 2004 restart or shut down unexpectedly.

Ethan closed his laptop after a late meeting, slid it into his backpack and took the train home. When he opened the bag, the laptop was hot enough to be uncomfortable to hold, the fan was running and the battery had dropped from 70 percent to 9. The next morning, it had restarted by itself overnight and lost an unsaved document. He asked Jake whether the laptop was faulty. Jake ran two commands and opened one report. The laptop was not broken. It was using Modern Standby, and a sync app plus Windows' nightly maintenance had kept it busy inside the bag, while a pending update had restarted it at 3 a.m. Twenty minutes of settings changes later, it hibernated when closed and woke only when Ethan opened it. This page explains what Modern Standby is, why it causes these problems and how to fix each one.

What Modern Standby is

For most of Windows' history, sleep meant a state called S3. The PC saved its work in memory, turned off almost everything else, and did nothing until you pressed a key or opened the lid. It was simple and predictable, but waking took a few seconds and the PC could not check email or receive notifications while asleep.

Modern Standby, technically called S0 Low Power Idle, works like a phone instead. When you close the lid or press the power button, the screen turns off and the processor drops into very low power states, but the system never fully stops. It wakes briefly and quietly to sync email, receive messages, download updates and stay connected to the network, then drops back down. Waking is almost instant. Microsoft introduced the idea in Windows 8 as Connected Standby, and the term Always On, Always Connected was used for PCs, especially those with built-in mobile data, designed around it. In Windows 10 and 11, it became Modern Standby, and most new laptops now use it.

The catch is that the PC's behavior while asleep depends on software. If an app, driver or Windows task keeps the processor busy, the PC does not really sleep, and in a closed bag with no airflow, a busy processor heats up and drains the battery. That is the root of most Modern Standby complaints.

Laptops with mobile data

The original Always On, Always Connected idea was built around laptops with built-in mobile data, through a SIM card or eSIM, so they could stay online anywhere, like a phone. On these laptops, Modern Standby can use mobile data while asleep, which affects both battery life and your data allowance. If you pay for data by the gigabyte, set the cellular connection as metered in Settings > Network & internet > Cellular, which limits background downloads, and consider disabling network connectivity in standby on battery.

Cellular modems also appear in sleep studies as offenders when signal is weak, because the modem works harder to stay connected. On a train or in an area with poor coverage, a laptop in standby can drain faster than at home. Hibernate on lid close avoids this. Our guide to connecting Windows to a cellular network covers SIM and eSIM settings.

Check which sleep your PC uses

To see which sleep states your PC supports, open Terminal or Command Prompt and run:

1. Right-click Start and choose Terminal.
2. Type powercfg /a and press Enter.
3. Read the list under The following sleep states are available on this system.
4. If it shows Standby (S0 Low Power Idle) Network Connected or Network Disconnected, your PC uses Modern Standby.
5. If it shows Standby (S3), your PC uses traditional sleep, and most of this page's Modern Standby advice does not apply.

The output also shows whether Hibernate and Fast Startup are available. If Hibernate is listed as unavailable, it may be turned off; running powercfg /hibernate on from an administrator Terminal turns it back on, which you need for the hibernate fixes below. Our guide to Sleep or Hibernate missing from the power menu covers the menu side.

It is worth running the command even if you are sure of the answer, because the result changes what helps. Advice written for S3 sleep, such as disabling hybrid sleep, does little on a Modern Standby laptop, while settings like network connectivity in standby only exist on Modern Standby PCs.

Common Modern Standby problems

Several of these can happen together, as on Ethan's laptop. Work through the diagnosis first, so you fix the actual cause rather than changing settings at random.

The order to fix things

Faced with a hot bag, a drained battery or overnight restarts, it helps to fix things in order. First, install all Windows updates, optional driver updates and the PC maker's BIOS and driver updates, since many standby bugs are already fixed. Second, set the lid to hibernate on battery, which immediately stops the worst symptoms while you investigate. Third, run a sleep study after a day or two of normal use to see what is still causing activity. Fourth, deal with the specific offenders: network connectivity in standby, background apps, maintenance wakes and devices allowed to wake the PC. Finally, check Event Viewer for any remaining unexpected shutdowns and look at the battery report if they continue.

Most laptops are fixed by the first two steps. The rest are for stubborn cases and for people who want instant wake back without the side effects.

Find out what kept it awake: the sleep study

Windows records what happens during every Modern Standby session. The sleep study report turns that record into a readable page. To create it, open Terminal as administrator, run powercfg /sleepstudy, and open the HTML file it saves, usually sleepstudy-report.html in your user folder or the folder Terminal was in. The report covers the last three days by default; add /duration 7 for a week.

The report lists each standby session with its length, the battery drained and the percentage of time the PC spent in its lowest power state, shown as a bar. Sessions with high drain or low time in low power are the problem ones. Expanding a session shows the top offenders, the devices, drivers and software activity that kept the PC busy, such as a network adapter, a sync service, a specific app or Windows Update. That list tells you what to fix.

Two other commands help. powercfg /lastwake shows what woke the PC most recently, and powercfg /waketimers lists scheduled tasks allowed to wake it. powercfg /requests, run while the PC should be idle, shows apps and drivers currently preventing sleep, such as a browser playing media.

powercfg commands at a glance

Most of these work from a normal Terminal window; sleep study and hibernate changes need an administrator Terminal. The reports are saved as HTML files you can open in any browser and share with a support team.

Use hibernate to stop hot bags and drain

The most reliable fix for a hot bag or overnight drain is hibernate. When a PC hibernates, it saves everything to the drive and turns off completely. It uses no battery, cannot wake itself in a bag, and resumes with your apps and documents open, just a few seconds slower than standby.

The simplest change is to make closing the lid hibernate instead of sleep. Open Control Panel > Hardware and Sound > Power Options, select Choose what closing the lid does, and set When I close the lid to Hibernate for On battery, and optionally for plugged in. If Hibernate is not listed, select Change settings that are currently unavailable and check the Hibernate box under Shutdown settings. In Windows 11, newer versions also show lid and power button options in Settings > System > Power & battery.

A middle path keeps instant wake for short breaks while preventing long drains: set the PC to hibernate after a period of standby. In Power Options, open Change plan settings > Change advanced power settings, expand Sleep, and set Hibernate after to a value such as 30 or 60 minutes on battery. Some PCs hide this option under Modern Standby; on those, the lid-close setting is the reliable route. Our guide to sleep mode and lid settings covers these screens in detail.

Hibernate writes the contents of memory to a file on the drive, called hiberfil.sys, which takes space roughly equal to a portion of your installed memory. On PCs with small drives, that space is worth knowing about, but on most laptops it is a fair price for a cool bag and a full battery.

Limit network activity in standby

Much of Modern Standby's activity is network traffic: email sync, cloud storage, messaging apps and updates. On PCs that report Network Connected standby, turning off network connectivity while asleep cuts most of that activity and is often enough to fix drain.

On Windows 11 Pro and other editions with the Group Policy Editor, run gpedit.msc, go to Computer Configuration > Administrative Templates > System > Power Management > Sleep Settings, and set Allow network connectivity during connected-standby (on battery) to Disabled. There is a separate setting for plugged in. Some PCs also show a Networking connectivity in Standby option in the advanced power settings. After the change, powercfg /a may report Network Disconnected standby. Email and messages then sync when you open the lid rather than in the bag.

Apps can also be limited individually. In Settings > Apps > Installed apps, select an app's three-dot menu, choose Advanced options where available, and set Background app permissions to Never for apps that do not need to run in the background. Cloud sync tools usually have their own setting to pause syncing on battery.

Docked laptops and closed lids

Many people use a laptop closed, connected to an external monitor, keyboard and mouse. With Modern Standby, closing the lid can put the laptop to sleep even while it is docked, which turns off the external screens. To keep working with the lid closed, open Power Options > Choose what closing the lid does and set When I close the lid to Do nothing for Plugged in, while keeping Hibernate or Sleep on battery.

The trap is unplugging. If you undock a laptop set to do nothing on lid close while plugged in, then put it in a bag, it may stay fully awake. Setting the battery lid action to hibernate protects against that, because Windows switches to the battery setting as soon as the power cable is removed. It is worth checking that the laptop has actually gone to sleep or hibernated before packing it, by looking for the power light.

Stop the PC waking by itself

If the PC wakes when nobody touched it, find out why with powercfg /lastwake right after it happens. Common causes and fixes:

Scheduled maintenance. Windows runs automatic maintenance at night, by default around 2 a.m., and can wake the PC to do it. Open Control Panel > System and Security > Security and Maintenance, expand Maintenance, select Change maintenance settings, and clear Allow scheduled maintenance to wake up my computer at the scheduled time. You can also move the maintenance time to when the PC is usually on.

Wake timers. Scheduled tasks, including Windows Update tasks, can wake the PC. In advanced power settings, under Sleep > Allow wake timers, choose Disable on battery, or Important wake timers only. powercfg /waketimers shows which tasks are set to wake it.

Devices. Mice, keyboards, network adapters and USB hubs can wake a PC. Run powercfg -devicequery wake_armed to list them. In Device Manager, open a device's Properties > Power Management tab and clear Allow this device to wake the computer for devices that should not, such as a sensitive mouse. Leave the keyboard enabled so you can wake the PC yourself.

Laptop will not wake or shows a black screen

The opposite problem, a laptop that will not wake from standby or wakes to a black screen, is usually a graphics driver or firmware issue. Try pressing a key, then the power button briefly. If the screen stays black but the keyboard lights work, press Windows key + Ctrl + Shift + B, which restarts the graphics driver. If nothing responds, hold the power button for ten seconds to force a shutdown, then start the PC.

To prevent it, update the graphics driver from the PC maker or the graphics chip maker, and update the BIOS. If the problem started after a driver update, roll it back from Device Manager by opening the display adapter's Properties > Driver > Roll Back Driver. Using hibernate on lid close also avoids standby wake problems entirely while you wait for a fix.

If the black screen happens only with an external monitor connected, the monitor or dock may be the problem rather than the laptop. Update the dock's firmware from its maker and try a different cable before changing laptop settings.

Unexpected restarts from Windows Update

A PC that restarts overnight with no crash in the logs has usually been restarted by Windows Update finishing an install. Modern Standby makes this more likely, because the PC is technically on and can complete updates while you think it is asleep. To check, open Event Viewer and look in Windows Logs > System for Event ID 1074, which records who or what started a shutdown or restart; Windows Update restarts name the update process.

To control it, open Settings > Windows Update > Advanced options. Set Active hours to cover when you use the PC, or let Windows adjust them automatically. Turn on Notify me when a restart is required to finish updating, so you get a warning. When an update is pending, restart at a convenient time yourself, or use Pause updates before an important deadline. Always save work before leaving the PC asleep, since a restart cannot save unsaved documents. If an update leaves the PC in a restart loop, our guide to an update stuck at 100 percent or in a restart loop walks through recovery.

If you want to avoid restarts entirely at a bad moment, choose Update and shut down or Shut down deliberately at the end of the day, rather than leaving updates to finish overnight. Our guide to shutting down without installing updates covers the options when you need to leave quickly.

Unexpected shutdowns: find the cause

A sudden shutdown without warning, as opposed to a planned restart, leaves records in Event Viewer. Open Event Viewer > Windows Logs > System and filter for these events:

1. Kernel-Power Event ID 41: the system rebooted without shutting down cleanly, from a crash, power loss or the power button held down.
2. Event ID 6008: the previous shutdown was unexpected, with its time.
3. BugCheck Event ID 1001: a blue screen crash occurred, with a stop code.
4. Event ID 1074: a planned shutdown or restart by a program or user, which rules out a crash.
5. Note the times and look for patterns, such as during standby, under load, or on battery only.

If Event 41 appears with a BugCheck, the PC crashed with a blue screen, often from a driver. To see the blue screen instead of an instant restart, open System Properties > Advanced > Startup and Recovery > Settings and clear Automatically restart. Our guide to PC crashes and blue screens covers reading and fixing stop codes. If Event 41 appears without a BugCheck, the power was cut, which points to overheating, the battery, the power supply or a firmware problem.

Reliability Monitor gives an easier view of the same information. Type reliability in Start search and open View reliability history. It shows a timeline of crashes, unexpected shutdowns, failed updates and app errors by day, which makes patterns easy to spot, such as shutdowns starting after a particular update or driver install.

Overheating and battery problems

Laptops protect themselves by shutting down when components get too hot. A laptop running in a closed bag, on a bed or with clogged vents can reach that limit. If shutdowns happen under heavy load, such as games or video calls, or in standby inside a bag, heat is a likely cause. Clean the vents with compressed air, use the laptop on hard surfaces, and fix standby activity so it does not run in the bag. A hardware monitoring tool can show temperatures under load.

Aging batteries cause sudden shutdowns too. A worn battery can report charge it cannot deliver, so the laptop shuts down at 20 or 30 percent without warning. Run powercfg /batteryreport and open the saved report: compare Design capacity with Full charge capacity. If full charge capacity is far below design, often under 60 to 70 percent, or the battery history shows sudden drops, the battery may need replacing. A swollen battery, which can lift the keyboard or trackpad, is a safety risk and should be replaced promptly.

Battery care on Modern Standby laptops

Because Modern Standby laptops are often left plugged in and partly active for long periods, battery care settings matter. Many PC makers offer a charge limit, keeping the battery at around 80 percent when plugged in for long periods, which slows battery wear. Look for it in the maker's app or BIOS, under names such as battery health, smart charging or conservation mode. Some Microsoft Surface devices use smart charging that does this automatically.

Heat is the battery's biggest enemy, so the standby fixes on this page also help the battery last longer. A battery that regularly gets hot in a closed bag will lose capacity faster than one kept cool. Checking powercfg /batteryreport every few months shows how capacity is holding up.

If a laptop is mostly used on a desk, plugged in, a charge limit plus normal sleep is usually the best combination: instant wake when you sit down, and a battery that stays healthy for years.

Update BIOS, drivers and firmware

Modern Standby depends heavily on firmware and drivers working together, and many problems are fixed by the PC maker's updates rather than by Windows. Check your PC maker's support site or update app for BIOS or UEFI updates, chipset drivers, graphics drivers, Wi-Fi and Bluetooth drivers and, on Intel PCs, the Management Engine firmware. Our guide to finding your BIOS version helps you compare yours with the latest.

Windows Update also delivers many drivers. Under Settings > Windows Update > Advanced options > Optional updates, look for driver updates from your PC maker. Install BIOS updates only from the PC maker, with the laptop plugged in, and do not interrupt them. If a problem started right after a particular update, uninstalling it may help while you wait for a fix; our guide to uninstalling a Windows update explains how.

Antivirus and management software

Security and management software often appears in sleep study reports as a top offender, because it scans files, checks for updates and reports to servers while the PC is in standby. Microsoft Defender is designed to work with Modern Standby, but some third-party antivirus tools, VPN clients and corporate management agents are not as well behaved. If one shows up repeatedly with high activity, check for an update from its maker, look for settings that pause activity on battery or in standby, and report the problem to the vendor or your IT team.

Do not uninstall security software on a work PC to fix battery drain without talking to IT. On a personal PC, if a third-party antivirus is the culprit and no fix is available, Microsoft Defender alone provides solid protection and behaves well in standby.

Can you switch back to S3 sleep?

Some people would rather have traditional S3 sleep back. Whether that is possible depends on the PC's firmware. Many recent laptops support only Modern Standby, and their firmware does not offer S3 at all, so nothing in Windows can turn it on. Some PCs, especially business laptops and desktops, have a BIOS option to choose between Modern Standby and S3, often labeled as sleep state, Windows and Linux, or similar; check the BIOS setup or the maker's documentation.

On some PCs whose firmware still supports S3, a registry value named PlatformAoAcOverride, set to 0 under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power, has been used to disable Modern Standby, but it does not work on every version of Windows or every PC, and on a PC without S3 it can leave no working sleep at all. Back up the registry before trying it, and treat it as an experiment. For most people, hibernate on lid close gives the same predictable behavior with no risk.

Desktop PCs and random wakes

Desktops can use Modern Standby too, especially compact and all-in-one models, but more often they use S3 sleep. Desktops that wake on their own usually have a different cause: a network adapter set to Wake on LAN, a sensitive mouse, a USB device or a scheduled task. Run powercfg /lastwake after an unexpected wake, then turn off wake permission for the responsible device in Device Manager, or disable wake timers in the power plan.

Wake on LAN is useful in offices where IT wakes PCs remotely for updates, so check before turning it off on a work PC. At home, most people do not need it. In the network adapter's Properties > Advanced tab, options such as Wake on Magic Packet and Wake on Pattern Match control it; turning off pattern match stops most unwanted wakes while keeping deliberate remote wake.

Fast Startup and shutdown problems

Fast Startup makes shutdown a partial hibernation: Windows saves the system state to disk so the next start is quicker. It can cause problems of its own, such as updates not applying, devices not working after startup, or the PC not fully powering off. If you see shutdown or startup problems, try turning it off: open Control Panel > Power Options > Choose what the power buttons do, select Change settings that are currently unavailable, and clear Turn on fast startup.

Restart and shut down behave differently with Fast Startup. A Restart always does a full restart, which is why restarting fixes problems that shutting down and powering on does not. If you want a full shutdown once, hold Shift while selecting Shut down. If you need to restart or shut down a PC remotely, our guide to remote shutdown and restart shows the commands.

Sleep and shutdown myths

A few beliefs cause confusion. One is that a laptop with the lid closed is off. With Modern Standby, it is closer to a phone with the screen off: still running, just quietly. Another is that sleep uses no battery. Traditional S3 sleep used a little; Modern Standby uses more, and much more when something keeps it busy. A third is that shutting down always gives a fresh start. With Fast Startup on, shutdown keeps part of Windows' state, and only Restart clears everything.

People also assume that a sudden restart means failing hardware. More often, it is Windows Update, a driver crash or a power setting, all of which can be fixed in software. Hardware becomes the likely cause only when the logs show power loss with no crash, the battery report shows heavy wear, or the laptop is overheating under load. Checking those three things before buying a new laptop can save a lot of money.

Power plans and modes on Modern Standby PCs

Modern Standby PCs often show only the Balanced power plan in Control Panel, with performance controlled by the Power mode slider in Settings > System > Power & battery: Best power efficiency, Balanced or Best performance. That is normal. Missing plans are not a fault, and the advanced power settings still apply to the Balanced plan. Our guide to power plans in Windows explains when the other plans appear.

On battery, Energy saver (formerly Battery saver) limits background activity and can reduce standby drain. Setting it to turn on automatically at a higher battery level, such as 30 percent, helps on laptops that drain unpredictably.

Power button, Start menu and sign-in options

The power button on the laptop and the options in the Start menu can be set separately. In Power Options > Choose what the power buttons do, set When I press the power button to Hibernate or Shut down if you prefer the button to turn the laptop properly off, and keep Sleep for the Start menu when you want instant wake at your desk. Adding Hibernate to the Start menu's power options, from the same screen's shutdown settings, gives you a one-click way to hibernate before packing the laptop.

If the power options are missing from the sign-in screen or Start menu, a policy may be hiding them; our guide to the power button missing on the sign-in screen covers that case.

The 2020 bug: KB4557957 and Windows 10 version 2004

This page began in June 2020 with a specific bug. Windows 10 version 2004, the May 2020 Update, released in late May 2020, had a known issue on some devices with more than one Always On, Always Connected capable network adapter: they could show errors and shut down or restart unexpectedly. Microsoft placed a compatibility hold, also called a safeguard hold, on affected devices, including some Microsoft Surface models such as the Surface Pro 7 and Surface Laptop 3, so Windows Update would not offer them the new version.

Some users installed version 2004 anyway, by manual upgrade, and met the restarts. On June 9, 2020, Microsoft released cumulative update KB4557957, which fixed the issue, and later lifted the safeguard hold. The episode is a good example of how safeguard holds work: Microsoft blocks an update for hardware with known problems until a fix is ready, and installing around a hold risks exactly the problem it was meant to avoid. Windows 10 version 2004 is long out of support, and Windows 10 itself reached end of support in October 2025, so anyone still on that version should update.

Safeguard holds are still used today for new Windows 11 versions. If Windows Update says a new version is not ready for your device, that is usually a hold, and waiting is the safer choice. The hold lifts automatically once Microsoft and the hardware maker have a fix.

For businesses and IT teams

Organizations with fleets of Modern Standby laptops often see complaints about hot bags and battery drain, especially when security and management agents run in the background. Group Policy and device management tools can disable network connectivity in standby on battery, set hibernate timeouts and lid actions, and control wake timers across all devices. Sleep study reports from affected machines identify the agents and drivers responsible, which the software vendors can then fix.

Update policies matter too. Configure Windows Update restart behavior and active hours centrally, so laptops do not restart in the middle of the night with unsaved work, and test BIOS and driver updates from the PC maker on a pilot group before broad rollout, since firmware changes affect standby behavior directly.

Laptops on planes and in checked bags

Before a flight, shut down or hibernate your laptop rather than putting it to sleep. A laptop in Modern Standby can wake in an overhead bin or under a seat, run warm and drain its battery, and many airlines ask that devices in checked baggage be completely powered off because of the fire risk from lithium batteries. Hibernate or a full shutdown guarantees the laptop stays off.

Keep laptops in carry-on bags where possible, as airlines generally require for spare lithium batteries, and avoid packing them tightly against other items that could press on them. When you land, the laptop resumes from hibernate with your work as you left it.

What this page said in 2020

The original version of this page, from June 2020, reported that Always On, Always Connected PCs on Windows 10 version 2004 were restarting or shutting down unexpectedly, and that Microsoft's KB4557957 update fixed the issue. This rewrite keeps that history and expands the page into a complete guide to Modern Standby problems: hot bags, battery drain, unexpected wakes, overnight restarts and sudden shutdowns, with the commands to diagnose them and the settings that fix them.

Six years later, Modern Standby is standard on almost every new laptop, and the complaints have shifted from rare bugs like the 2020 one to everyday annoyances like hot bags and overnight drain. The diagnosis tools and fixes on this page cover both.

Modern Standby, unexpected shutdowns and restarts: frequently asked questions

Ethan's laptop now hibernates when he closes the lid on battery and sleeps normally on his desk. The sleep study showed the sync app and the nightly maintenance as the top offenders, and both now wait until the laptop is open. Windows Update tells him before it restarts. His bag stays cool, his battery holds overnight, and he has not lost a document since.

Revision note. Written October 3, 2026, rewriting our 2020 note on KB4557957 and Always On, Always Connected PCs into a complete guide to Modern Standby problems, unexpected shutdowns and restarts on Windows laptops. May your laptop sleep only when you ask it to.