To document for someone else: end solution was rolling back the BIOS several versions, which ended my random reboots.

I think this is solved.

Pertinent troubleshooting steps:
1. Swapped out RAM - ended BSODs.
2. Swapped out PSU - did not end black screens.
3. Left EXPO on but turned off memory context restore...

On a hunch, I swapped in RAM on the mobo compatibility list, and the BSODs went away. Everything was great for a few days (passed Prime95 and CoreCycler overnight; no crashes), until the system...

Thank you for such a comprehensive response!


This is the in-place Windows Upgrade that I mentioned during troubleshooting. (Reinstall Windows; preserve files.)


To gently push back, AMD has...

In the past week or two I have started experiencing multiple daily BSODs, under Win10 Version 10.0.19045 Build 19045.

When I am at the computer, these have always occurred when I have Mozilla up...