Currently my Uptime is 7 days, 23 hours, 43 minutes, no issues so far... I haven't done anything to decrease the load, but with 10/20 core Xeon the server is mostly idling at 7% CPU. I did forward syslog to an external server (old Qnap) to capture events before they are lost due to a server restart.
I have been using Unraid for 4,5 years, so far this is the only serious fault I have witnessed. With old e-waste server(s) that is a pretty good score in my book.