Question Ryzen 5700G help

[pandatom]

I've got a 2.2 year old Ryzen 5700G in a system that's been working fine for the 2+ years. Suddenly the system (Win 11) started freezing or restarting randomly (not under loads). I tried an alternate install of Win 10, same problem. I tried installing Ubuntu, this was more stable but did eventually do one or the other (occasionally while booting). I tried reinstalling Win11 and that hung every time.
At first I thought mem, so I did memtest (nothing) and full-swapped the mem out. No luck; I tried a new motherboard, also no luck. At this point it feels like it must be the CPU (minimal PSU load, new heavy duty PSU) but do CPUs fail in such. way that load isn't the issue, but it's random crashes? or is it worth trying a new CPU first?

Any advice appreciated, thanks.

 

[helpstar]

please list all of your hardware
psu make and model
motherboard plus bios version

did you try different hard drives?

temperatures fine?

 

[pandatom]

Temperature fine, immediately after the crash shows as 100F. I tried throttling CPU and IO, no results. Tried about 6 different hard drives/OS installs if you count USB sticks. In each case, I unplugged all other drives.

I tried two different motherboard with the latest bios (can't get at one since it's not installed):

PSU: RM850x (Corsair)
Current mobo: A 520M S2h F18 bios
Prev: Prime b550Plus

Have tried 2 different graphics card and onboard graphics,

I can't get at the brands of the two different sets of mem sticks but they both had the issue.

 

[Roland Of Gilead]

Hey there,

I'd prob just go ahead and update to the latest F19 bios. Then be sure to clear CMOS afterwards. This is an important step.