Have had a 6 GPU machine running for months just start to crash. Running V11. 2 other 6 GPU machine clones running fine. Rig is on for about 6 hours and then gets the wonderfully non-specific kernal 42 power error.

Maybe just a bad riser after all this time of constant running? PSU is an EVGA 1300w. No settings in OVerdriven are being reset so doesn't seem like the driver is unhappyand resetting cards or anyting like that.