An upgrade process involves heavy CPU use, disk read/writes, and at least a few power cycles in short time period. Depending what OP was doing on it otherwise, it could've been the highest temperature the device had ever seen. It's not so crazy.
My guess would've been SSD failure, which would make sense to seem to appear after lots of writes. In the olden days I used to cross my fingers when rebooting spinning disk servers with very long uptimes because it was known there was a chance they wouldn't come back up even though they were running fine.
My guess would've been SSD failure, which would make sense to seem to appear after lots of writes. In the olden days I used to cross my fingers when rebooting spinning disk servers with very long uptimes because it was known there was a chance they wouldn't come back up even though they were running fine.