Mouso core worker process

Same -- no report of MoUsoCoreWorker requests (or any others) with powercfg, but still won't sleep on 2004. 

MS apparently does not care about user experience, OR they lack the resources to investigate, which seems less likely, but their adamant refusal to acknowledge this problem and deal with it makes it appear increasingly likely that it's an active decision they've made. Whatever their reason for choosing to aggravate us to death with this persistent bug, an up-to-date sleep troubleshooter might help many of us.

I noticed the same issue with my desktop WIN10 2004, while the monitor would shut off as defined in Power & Sleep, the computer would not sleep automatically. I could make it sleep manually.

I ran powercfg /requests as suggested- mousocoreworker was there.

I looked in Update History, noticed that KB4586876 had failed installation a few times. Followed instructions to download it and installed successfully. After reboot, mousocoreworker was no longer there and the PC did sleep as it should.

Will see if this lasts...

I started noticing that my PC was not going into sleep mode and I had to do something about it because it was disrupting my sleep!! 

I noticed that the MoUsoCoreWorker process was present in my powercfg requests and it kept coming back. 

Upon further investigation I found that someone mentioned that updating your PC may fix the issue.  I didn't believe it , but when I checked for updates I noticed that there was an issue, and it was showing that I had a failed update. There was also an option to download and install a new feature update for Win10. 

I downloaded the feature update, installed it and restarted my machine. This enabled the update check to work on my PC again and it found an additional update to the .net framework. I installed that and restarted the PC again. 

Then as a test I attempted to put the PC to Sleep by lowering the settings to 1 minute and it worked!!

This may not work for everyone but the first thing to do is - 

Check to make sure that you don't have any issues with any Updates and that your PC is fully up to date. 

I'm so happy because the noise was driving me insane at night and I couldn't sleep either.

I started noticing that my PC was not going into sleep mode and I had to do something about it because it was disrupting my sleep!! 

I noticed that the MoUsoCoreWorker process was present in my powercfg requests and it kept coming back. 

Upon further investigation I found that someone mentioned that updating your PC may fix the issue.  I didn't believe it , but when I checked for updates I noticed that there was an issue, and it was showing that I had a failed update. There was also an option to download and install a new feature update for Win10. 

I downloaded the feature update, installed it and restarted my machine. This enabled the update check to work on my PC again and it found an additional update to the .net framework. I installed that and restarted the PC again. 

Then as a test I attempted to put the PC to Sleep by lowering the settings to 1 minute and it worked!!

This may not work for everyone but the first thing to do is - 

Check to make sure that you don't have any issues with any Updates and that your PC is fully up to date. 

I'm so happy because the noise was driving me insane at night and I couldn't sleep either. 

Same here ... this must be addressed next update ... most annoying thing ...!!!

I started noticing that my PC was not going into sleep mode and I had to do something about it because it was disrupting my sleep!! 

I noticed that the MoUsoCoreWorker process was present in my powercfg requests and it kept coming back. 

Upon further investigation I found that someone mentioned that updating your PC may fix the issue.  I didn't believe it , but when I checked for updates I noticed that there was an issue, and it was showing that I had a failed update. There was also an option to download and install a new feature update for Win10. 

I downloaded the feature update, installed it and restarted my machine. This enabled the update check to work on my PC again and it found an additional update to the .net framework. I installed that and restarted the PC again. 

Then as a test I attempted to put the PC to Sleep by lowering the settings to 1 minute and it worked!!

This may not work for everyone but the first thing to do is - 

Check to make sure that you don't have any issues with any Updates and that your PC is fully up to date. 

I'm so happy because the noise was driving me insane at night and I couldn't sleep either. 

Same here ... this must be addressed next update ... most annoying thing ...!!!

You are very welcome ;)