Windows 10 update breaks sleep mode feature – but there’s a fix

Windows 10 Sleep Mode

All Windows 10 devices ship with a feature called ‘sleep mode’
where the system simply goes into a low power state and remains
that way.

After the rollout of
September 2020 optional update, users are reporting that
their computer keeps waking up from sleep mode. If it happens
to you, there may be a few settings you can tweak to fix the

The first step in figuring out problems with Windows 10’s sleep
mode is determining what’s doing the waking. In this case,
users discovered that “MoUSO Core Worker Process
(MoUsoCoreWorker.exe)” resulted in sleep interruption of their

USO Core Worker Process is a process that’s related to Windows
Update and it could cause unwanted wakeups after you apply
Windows 10 version 2004 and
optional update is pending for installation.

“When I close the lid, press the power button, or select Sleep
in the power menu or the win-x menu, instead of sleeping, the
screen simply turns off, and my laptop does not go to sleep
even after leaving it alone all night,” one user noted on
Feedback Hub, and there are similar complaints on Microsoft’s

The problem with sleep mode was first reported after the
release of Windows 10’s May 2020 Update and it was fixed with

Windows 10 KB4568831.

Now, less than a month later, the same problem with Windows 10
has reappeared, though it may not be affecting everyone.

As we mentioned at the outset, it appears that Windows Update
is a fickle beast here and you may be able to solve this
problem easily by diagnosing Windows Update.

How to fix sleep mode issues on Windows 10 after version 2004

One way to fix the problem is by using Windows Update’s
Settings to schedule those updates and reboots and prevent the
update service from running at odd hours. Once done, you would
need to reboot your computer and try the sleep mode again.

If you’re unable to fix the sleep mode issues by tweaking your
update schedule, you can also try these advance steps:

  1. Open Windows Search.
  2. Search for ‘Services.msc’.
  3. In the Services window, look for ‘Windows Update’
    Stop Windows Update service
  4. Click on Windows Update and select ‘Stop’.
  5. Click on the same entry again and select ‘Start’ and then
    select ‘Restart’.
  6. Go to Windows Update and click on Check for updates.
    Install the pending updates and reboot your device.

It’s worth noting that this is a temporary solution and a
proper workaround is not yet available.

Once done, MoUsoCoreWorker.exe should no longer prevent the
sleep mode on your laptop or 2-in-1.

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