I've seen this reported before but wanted to throw in my diagnostics and see if someone can have a look. I'm a new unRAID user and am enjoying it very much. I ran these diagnostics this morning but after 3 hours they did not finish. I then restarted them and they still seemed to be hung. I then removed a 1.5TB WD USB drive I had plugged in and voila. Maybe the external drive is the issue?   Thank you tower-diagnostics-20181121-1322.zip