One documents folder is under "Quick Access" while another appears under "This PC". If you only want to see it once, disable Quick Access.
How to Disable Quick Access in File Explorer on Windows 10

I've read your post again and my reply did not address your actual problem. I guess I had some kind of brain fog at the time. My apologizes for sending you on a wild goose chase. Glad your idle was...

You are quite welcome.

If interested, there is a lot of information about various capacitor problems. Google "Capacitor Plague"

Excerpt from Wikipedia:
"The capacitor plague was a problem...

Look for a motherboard that does not use electrolytic capacitors which is the weakest link in electronic circuit design. Although not perfect, look for boards that exclusively use Polymer types....

I would try the substitution method to see if the problem stays or goes. If possible, substitute a different power supply known to be good. Electrolytic capacitors found in power supplies as well as...

I too have found little value in Restore Points and abandoned them long ago. What I have found to be extremely useful is to run 3 low-capacity (500 GB) hard drives simultaneously . One drive (H) has...

You also might want to take a look at Dynamic frequency scaling (also known as CPU throttling). Under Windows 10, the CPU is throttled back to 5% when the computer is idle and then gradually goes...