Hi,
I gave my parents my custom PC of 8 years to them. Starting having the shuttering issues mid/late last year. Over the Christmas holidays, I completed a fresh Windows install. Once I did that, the system ran great (as newly installed systems do). Came back and visited the family for Easter and my dad told me that the PC shutters and that nothing had changed (as if the work I did was for nothing.) Puzzling, I once again found the PC was shuttering. I found this thread and read through the pages of comments. This lead me to researching windows updates and uninstalling the first windows update after I completed the fresh install.
For the other users out there, to check the update history and uninstall windows updates in CMD:
https://pureinfotech.com/check-update-history-windows-10/
I uninstalled KB4562830.
After uninstalling KB4562830 followed by a reboot, system runs smoothly once again without shutter. I prior to rolling back an update, I did try disabling Notification Center, updating video and audio drivers. None of those had an affect. 100% a windows issue. Now I'll have to figure out how to disable windows update or particularly prevent this update from installing.