Had my timings stable for a couple of weeks then pushed fclk to 2100, looked stable. Then was playing with the pbo scalar setting but my pc would sometimes lock up and restart randomly, so left scalar on auto. Still crashing, so changed fclk back to 2000 thinking that was it... still crashes randomly. Heavily dialed back my CO settings and Ram timings. Would leave Prime/corecycler/testmem running but would come back after a couple of hours and find pc restarted.
Was losing my mind thinking my CPU was dying or something then remembered I updated the Lian Li L-Connect fan software to version 3. Looked it up and other people were getting pc crashes with it too. Turns out it was just the crappy RGB fan software crashing my pc.