I'm starting to believe you are correct. I initially ran this box with a Supermicro x9scl mobo and cpu and it ran perfect. It just couldn't handle transcoding and the mobo didn't have a slot for a gpu card. I upgraded the mobo to the Supermicro x11ssh-f and the cpu to the xeon e3-1285v6. Ram went from 32 to 64. All drives, psu, cooling, case stayed thee same.
I started having failures. I changed the ram and still same issue. I changed the mobo and same issue. I changed the psu from 600 80+ white to 850 80+ gold. I added liquid cooling. I added a Tesla P4. Nothing has eliminated the problem. The only thing left is the CPU. I am waiting for a xeon e3-1270v6 to arrive in a few days. I'll swap it out and see if that helps. If not then I'm at a total loss as to what could be causing it! Could it be bios related? I have BMC connected, but don't have the password, so I will need to reset it via the jumper? Then I can review it on a remote pc. I have link aggregation connected from the mobo to my ASUS GT-AC5300 router. I literally have no idea what else to try?!
I have the syslog going to root on the flash drive, but nothing seems to stand out to you or others...
Do you think it could just be a bad CPU?!