Yes I have a UPS, and my Synology is set up as the network UPS server. None of my other devices had any power issues at the same time. Maybe it's time to swap in a new power supply?
Glad to hear the MCE isn't a major concern, though I had figured the two events may be related.
I got a ping on my phone that a parity check started, so I knew that for some reason the server rebooted itself. About 10 minutes later, got another ping that a Machine Check Event was detected. Posting diagnostics here to hopefully get some insight as to what the issue might be. Thanks.
plex-unraid-diagnostics-20210726-1937.zip