I've Had CPU Stalls in the past, But wasn't able to log them due to some Checksum issues, preventing me to set the mirror to flash for the syslog 

it took me over 20 tries of "long formatting" the USB & reinstall from a backup image,
to get the checksum error to go away, which made me think that their was something wrong with the USB Drive
Tried Backup a Drive, had the Same Issue, Sometimes it didn't even load properly stuck on the Unraid Boot Selection Screen, Tried booting Windows, It Froze during loading, which made me think I either had a memory issue or a CPU Issue,

so I Performed a Memtest (motherboard doesn't support legacy boot so had to use memtest86 v6.20 from a different flash drive) which passed,

Then Strangely booted into windows successfully, so I tried Unraid again which Worked for 2 Days (during which I set the Syslog to mirror to Flash & run a Diagnostics, seetower-diagnostics-20230725-1551.zip)

 

it the disconnected from the network today (its connected via ethernet over Power) Check the monitor Won't Display Any text,
Forced Shutdown, Check the Syslog on the Flash, nothing interesting as it purged it for being too long.

Reset Working for about 30mins, Noticed it Hangs on the Docker Selection Screen, which is something that almost never happens
Disconnects Again, Monitor Shows Multiple Call Trace Issues (See Attached Photos), at this point I Power it Off & Check the Syslog
which captured some of the call Trace Issues, See syslog.txt

I should probably setup a syslog server to monitor the Unraid server in the future 

Try updating to latest stable, also look for a board BIOS update and/or test with just one stick of RAM at a time.

good Call, It was indeed a Faultily Ram Stick