you've already found the problem... it's most likely your PSU. got a spare you can test with?
100% not their PSU, im having the EXACT same problems, even after deleting the game and all the files in app data every few hours my screen starts freezing and my computer needs a total restart to get back into working condition again.
Like....Jesus Christ this game is already a bug-riddled hot mess already that made me unable to finish act 3 due to how broken it is and now ontop of that its completely ruined my GPU?
A quick google search will tell you that there are lots of people whose systems have also been permanently damaged by this buggy mess and it pisses me off that now im going to need to spend a ridiculous amount of money buying new parts for my system all because Larian decided that they had to beat the starfield release and pushed this bug-filled mess they call a game out way before it was ready.
