MSI Z270-A PRO with 7 GPU used to run  fine for almost a year. Suddenly yesterday I had ~50 restarts so I tried to figure out what is going on.

Didn't find any suspicious change notes so I started to review my hardware.

First: It is mining well for about 4-10 minutes then it shows error "gpu fault detected 147" after this error all GPUs still mining for about 10 seconds then instantly reboots with command: "sysrq resetting" which isn't any watchdog of Claymore.

What I tried already: reduced OC, increased voltage, different PSU, brand new risers, checked all cables if they are burned or heating up fast (all were fine, healthy and cold) and it's no change.

Guys what has happened, have you any suggestions? My script which worked fine for some time looks like this: