Having the same issue as well, temperature alarm goes off after a short time forcing me to turn off the power at the socket as it won't shut down otherwise. It happened once a couple of months ago, then again recently but 3 times over the last 3 days, I just installed an M2 and I am worried that made the problem worse somehow. Debating trying to return the GPU since i have only had it for 3 months, but first I am going to try a fresh windows install. I have also re-seated the GPU and made sure the power connectors were in properly.
Ok well that didn't work.