Since I upgraded from Windows 7 to Windows 10, several times now I have found my power plan changing by itself.

I have defined a custom power plan that puts my computer to sleep after 45 minutes. But several times, I have found my power plan changed to put my computer to sleep after only 5 minutes!

I have now checked the Event Viewer and discovered that in the source UserModePowerService, something called TiWorker.exe has "reset the policy scheme." Here's just one of many:

Process C:\Windows\WinSxS\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.10586.424_none_767fbf7a263fc7d3\TiWorker.exe (process ID:2676) reset policy scheme from {973f78ed-8b25-49b1-8e38-e2364a5f2784} to {973f78ed-8b25-49b1-8e38-e2364a5f2784}

I assume that TiWorker.exe is a Microsoft thing. Any idea what could be going on here?