Was not able to pull diagnostics site as both UI and diagnostics command were hanging, so I've manually pulled syslog file. I have a separate diagnostics file that I've generated about 2 hours before failure if needed.

 

Thanks,

Maxim

syslog

I also captured ps -aux output

ps.txt

System crashed again, but this time I wasn't even able to connect from console - could only capture a screenshot (attached). Also attaching the diagnostics package executed after system reboot. In both cases the crash happened when copying files from one drive to another running Midnight Commander through putty. I am running unraid 6.3.5 on ASRock 1900-ITX motherboard and 4 drives. Initially I thought it might be caused by Realtek network card, so I've installed Intel  I210 PCIe card.

htpc-diagnostics-20170919-2204.zip

Check the RAM and your Power-Supply