...bought an X570 Toma back in May/June, to run with a 3600.
Bought an 3800XT in October/November and updated the bios to 14 using the MSI application.
Failed the first attempt, appeared to succeed in the second.
Since then I have had periodic blue screens - usually when playing youtube videos from Firefox.
Never during gaming. And strees testing with P95 and a Farcry5 for an hour would never generate a hiccup.
Did all the usual tests for memory / driver verification / chkdsk / est, no errors of problems detected.
These became regular enough that i decided to reinstall Windows...
Turns out it looks like its a hardware problem, as I was getting blue screen errors (of all types) even during the installation process.
Blue screen when i removed one stick, then again when i swapped that out for the other.
Blue screens when I swapped GPU's.
Blue screens when I unplugged all additional sata devices.
Blue screens when I swapped boot ssd.
Only thing I haven't tested yet is the CPU, but these usually work or don't work, and the culprit seems very likely to be motherboard (especially after a bios update).