Got this exact same issue. Happens every few days and have to power down and wait half a minute, then boot back up to 'fix'... and by fix I mean it loosely since it's a recurring problem. All started with windoze 11 install, but no way to tell if it's the os, mobo, cpu, etc because nothing throws an error. being pegged at 0.53ghz is retarded and would be nice to have some sort of answer as to the cause of this issue and/or possible fix.