Or at least semi random. They seem to happen occasionally when I'm running AI inference workloads like Ollama. I'm suspecting it's heat related, but this time the room was relatively cool. Like the room was cooler than it usually is. Is there any insight in this diagnostic as to what caused the last reboot? It just happened right before this diagnostic was pulled.kerbol-next-diagnostics-20250920-2100.zip

Unexpected reboots are almost invariably hardware related. Heat could be a cause, but other issues such as insufficient power are common. Unfortunately if the reboot IS hardware related then there is typically nothing logged to give the reason.

The syslog in the diagnostics is the RAM version that starts afresh every time the system is booted. You should enable the syslog server (probably with the option to Mirror to Flash set) to get a syslog that survives a reboot so we can see what leads up to the problem. The mirror to flash option is the easiest to set up (and if used the file is then automatically included in any diagnostics), but if you are worried about excessive wear on the flash drive you can put your server's address into the remote server field and log to a share instead.