Update: After reading ResTeAZy's solution I always investigated my PSU and it seems like exactly the same thing was happening. I purchased a 1000W PSU and I've been able to play for a few hours without a crash! Seems like it was a hardware issue after all.
I commented on the other thread as well but might as well post it here too:
Mobo: Asus B650 Tomahawk
GPU: 7900 XT
CPU: 9800X3D
RAM: Corsair 32GB DDR5
Memory usage only gets to around 12GB and then will just crash my PC. Have to do a hard reset on the PSU.
Temps are fine so it's not a thermal issue. I was able to play the beta with no crashes.
Turned off Precision Boost Overdrive, and Core Performance Boost. I also updated to the latest B650 Tomahawk BIOS firmware (Stable) V E7D75AMS.1O0
I was able to get into game and play one but during the transition to the next match it crashed again. It almost never seems to happen during gameplay, always during loading into the match.