I’ve been experiencing this for a while with lots of video decoding (Google Meet) on Linux. It seems like anything with a lot GPU access will eventually cause it to restart. I don’t get any signs of a kernel panic, so I’m pretty sure it’s a hardware issue.
The latest beta firmware update mentions “Fixed ALS sensor communication failures”, and on the LVFS site mentions “Fix issue with invalid critical temperature _CRT in ACPI”, so I’m giving it a go to see if it fixes that.