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NUC 13: Random Freeze
(alien.top)
Number one cause of random hard crashes/hangs is RAM. Re-seat it, replace it, down-clock it, run a single stick, do everything you can to either rule it out as a problem, or to isolate the problem to a particular module or channel.
Memtest86 didn't find any problems, but I'll try out some different RAM configurations. Got some spare DIMMs flying around..