Well it looks like Plex docker was not source of the issue. Instead of hourly freeze or reboot now it seems to last 6-8 hours and then still hangs or reboots. Getting frustrated with this issue with logs not showing any source of the problem and constant crashes causing lot of parity data issues but not able to complete parity check to repair before another crash.
Any ideas on enabling any other logging or troubleshooting. I have tried memtest and it passed, tried disabling DOCP memory profile so it lowers the RAM speed back to stock, disabled C-STATE completely in Bios but issue still persists. I even removed the new parity drive installed last week but still had same issue.