PSU? Need more info, like all your settings, RAM, how you have the 3600 set in BIOS, any OC? The 20.8.3 might be a better driver, also be sure to use DDU in safe mode when changing drivers out. See if running it in DX11 vs. DX12 stops it. If it does, I'd alter the config file to start the game in DX11 all the time. FYI, WOW has issues that the dev's never fixed that might cause this as well.
"It worked before you broke it!"