Some time later...
Still crashing but much less regularly. I've started a post in the Plex forums as it always seems to crash during Plex maintenance, and might be related to when Plex updates it's...

Thank you zbook - It seems about the time you were posting instructions for me to gather information, I was shutting the machine down and unracking it.
For list of things I tried to fix too long to...

A Cyberpower 1500va/1350W UPS is used to power the rack that contains this PC (850W psu), an 8bay (5 disks) Synology NAS, a TP-link 16 port 1GB switch, a Motorola MB8600 cable modem, a netgear R7000...

Repeated almost daily BSOD for several months

I run a win10 22h2 machine in a rack in a utility closet.
On that machine, I run Plex media server for family, and Tautulli monitoring app.
About 6-7 months ago (to my memory) - I started...