PC hard locks up, seemingly no issues

[Crablemet]

Hi all,

 

I been using my newly built PC just fine for 2-3 months now, no issues what so ever, then suddenly without any hardware or driver change some games like Painkiller or Rimworld would crash my pc.

The crash looks like this : Sudden stuttering, audio stuttering, full freeze, no command does anything completely locked up with the image frozen on the screen has to restart computer with hard reset button.

In some games it happens after 5 minutes (Painkiller, HL2) in some games an hour (DOTA2) in some only when I do a specific action (Rimworld opening the map).

Seems intensity or temps have no effect on this as DOTA and DOOM eternal is way more intense than HL2 yet they dont crash as quick. Might be windows trying to access or write to somewhere it cant and it crashes?

Nothing shows up in event viewer other than loss of power, no crashdumps generated either.

Did memory test all good, gpu stress test all good, cpu test all good, sdd test all good, low temps no overclocking running windows 10 latest drivers on everything including bios.

Specs : Ryzen 7 2700

RX5700 XT

Samsung ssd 256 gigs generic

600W PSU

16 Gigs of corsair vengeance ram(rgb)

I dont want to reinstall windows but it might just be that, any other suggestions?