I use the Beelink ME Mini for my TrueNAS install, and it’s been running like a champ until upgrading to this latest version. Now my unit shuts down after only running a few minutes. I’m in IT for 45+ years, so am fairly good at troubleshooting. I’ve tried repeatedly with the same result. I booted on the last version and it remains operational, switch back to 25.10.1 and BAM it shuts down after only a few minutes again.
You can try booting to previous boot environment, removing 25.10.1 and trying an upgrade again.
You can use Report a Bug in the TrueNAS GUI, smile icon on upper right for Feedback / Report a Bug or use Report a Bug at the top of this forum on upper right.
Full detailed hardware and pool listing may get you more feedback. You can also search the forum for Beelink as there have been numerous problems with them to see if anything helps.