I have been having this same issue now for a couple of months. It happens mostly when I am on Zoom or working in iMovie. I hear what sounds like a fan/hissing sound which starts quietly and then gets louder. At its loudest point, it shuts down. I have to manually restart. It logs the error...and the notification states that there was an error and my computer shut down. This is machine is only a few months old. Very upsetting that I am having this problem. Has anyone come up with a solution?
I spoke with a Mac tech briefly who reset "something" for me remotely. It seemed okay for a few days.
I just now ran the software update (Big Sur). And with 20 minutes to go (last leg, right before restart) it started to hiss for about 10 minutes (got louder) then shut down. I let it sit for a couple of minutes. Then I hit the touchpad... it picked up where it left off. Started to hiss again but restarted before the hissing got to its loudest point.
It seems okay for now. But I am nervous about this all happening again. I am also a teacher. And running Zoom appears to be the most problematic. I bought this computer especially for teaching. This is a huge disappointment.
I want to bring this in to get it replaced, but fear that I'll face the same problems. I welcome any and all suggestions, insight etc.
Thank you.
~d~