Windows locking into sleep mode

Same problem I had.       Try disabling all Power Saving features and options including Advanced options.  

Problem disappeared for me after doing so.   Been too lazy to re-enable one by one to determine when/if the problem would return.

Let's take a look at all places where Windows can suspend to try to find the culprit:

1. Check closely your Display, Sleep and Hibernate settings in Power Options following this guide:  https://www.tenforums.com/tutorials/2843-change-power-plan-settings-windows-10-a.html
2. Display timeout has been moved to Settings > System > Power & Sleep > Additional Power Settings, on active Power Plan choose Change Plan Settings then adjust Display timeout.

While there check also Advanced plan settings > Sleep > Allow Wake Timers > under Battery & Plug In options set to Enable, Apply, Save.

3. If your Power Options settings are set correctly then the next suspect is the screensaver which is mysteriously setting a 1 minute timeout to blank Screensaver when some Themes are chosen. Check that now at Settings > Personalization > Lock Screen > Screen Saver Settings.
4. This could also pertain to an issue of Unattended Sleep Timeout setting in Registry.  See the Marked Answer here for what has worked for others:  https://answers.microsoft.com/en-us/windows/forum/windows\_10-windows\_install/windows-10-keeps-going-into-sleep-after-1-minute/787e8cea-32ce-4ea0-a281-13c32a75352d?auth=1

Whenever modifying the registry, first set a System Restore point:  http://home.bt.com/tech-gadgets/computing/how-to-fix-windows-10-problems-with-system-restore-11364008291943

5. If System Unattended Sleep timeout is not present here's now to access it:  https://www.tenforums.com/tutorials/72133-add-system-unattended-sleep-timeout-power-options-windows.html
6. More troubleshooting when PC keeps shutting down: 

https://www.tenforums.com/general-support/66513-pc-keeps-shutting-down.html

https://www.computerhope.com/issues/ch000689.htm

https://superuser.com/questions/1019043/windows-10-sleeps-before-set-time

7. If you suspect overheating which can shut down the PC, then install CoreTemp to monitor temps from System Tray: 

https://www.thewindowsclub.com/core-temp-monitor-cpu-temperature

https://www.pcworld.com/article/2365089/computer-shutting-down-on-its-own-maybe-its-time-to-play-it-cool.html

8. Since sleep is overwhelmingly controlled by the Display driver, Update the Display driver from the PC or Display adapter maker's Support Downloads web page for your exact model number, HP Serial Number or Dell Service Tag - from the sticker on the PC. 

While there check also for newer chipset, BIOS/UEFI firmware (very important), network, sound, USB3 and other drivers, comparing to the ones presently installed in Device Manager reached by right clicking the Start Menu.

if this doesn't give you the latest or ideal driver for what you need, compare it to the driver offered by the Intel driver update Utility here: http://www.intel.com/content/www/us/en/support/detect.html

or the Nvidia Update utility here: http://www.nvidia.com/Download/Scan.aspx?lang=en-us

or the AMD autodect utility here:  http://support.amd.com/us/gpudownload/windows/Pages/auto\_detect.aspx

For Display issues one fix that is working is to Roll back or Uninstall the Driver on the Display Device > Driver tab, restart PC to reinstall driver.

You can also try older drivers in Device Manager > Display device > Driver tab > Update Driver > Browse > Let Me Pick.

Then you will know you've tried everything in addition to Windows Update drivers.

9. Check over these other working Sleep solutions which may also be involved:

http://www.makeuseof.com/tag/fix-windows-10-sleep-mode/

10. If this was caused by Windows Update(s) then you can check which were installed at Settings>Update & Security>Windows Update under Update History, then uninstall them from the link there, and immediately check for these again and hide with the Hide Updates tool explained here:  https://www.howtogeek.com/223864/how-to-uninstall-and-block-updates-and-drivers-on-windows-10/

You can also use System Restore to get before the problem began, then check for Updates with the Hide Update tool and hide them: https://www.windowscentral.com/how-use-system-restore-windows-10

11. If this was caused by a Version Update then for 10 days you can roll it back in Settings>Update & Security>Recovery and then hide it until it matures using the Hide Updates Tool which is explained more here:  

https://www.howtogeek.com/223864/how-to-uninstall-and-block-updates-and-drivers-on-windows-10/.

12. If no power setting is causing this then go over this checklist to make sure the install is set up correctly, optimized for best performance, and any needed repairs get done:  http://answers.microsoft.com/en-us/windows/wiki/windows\_10-performance/windows-10-performance-and-install-integrity/75529fd4-fac7-4653-893a-dd8cd4b4db00

Start with Step 4 to turn off Startup freeloaders which can conflict and cause issues, then Step 7 to check for infection the most thorough way, then step 10 to check for damaged System Files, and also Step 16 to test a new Local Admin account.  Then continue with the other steps to go over your install most thoroughly.

13)  If nothing else works then do a Repair Install, by installing Media Creation Tool and then choosing to Upgrade Now.  This reinstalls Windows while keeping files, programs and most settings in place, and is also the most stable method to advance to the latest version.   http://windows.microsoft.com/en-us/windows-10/media-creation-tool-install

If you want you can wait a few more days for the new version to be released into Media Creation Tool then you can use it to do the Repair Install also bringing you up to the latest version by the most stable method. Watch for the MCT to change the version listed at top here:  http://windows.microsoft.com/en-us/windows-10/media-creation-tool-install

I hope this helps.  Feel free to ask back any questions and let us know how it goes.  I will keep working with you until it's resolved. 

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Hi, 

I am also facing the same issue. My laptop is locking automatically after 2-3 minutes of starting the computer. It is not shutting down but locking. After staring again it is again locking. 

Please help me in this. Please give satisfactory solution for this.

I have the same issue, has been persistent since at least September of 2019, short, 1.5 second locking screen then sleep mode, mine has the added benefit of not responding to inputs other than the power button.  Though a quick tap to the power switch will usually allow me to recover my progress with only a slight delay, more often than not I have to completely shut down and reboot my PC when this happens, with my luck it happens mid game most of the time so it really sucks considering this is an ASUS gaming laptop.