Random Restarts, Auto Restart disabled

This is far beyond my ability to troubleshoot.

Any help very much appreciated!

15E, 141, 144 errors shown in the error log folder
Numerous Critical (Event ID 41) errors in the System event log

I suggest starting with these free hardware diagnsotics:
1) Memtest86 (not 86+): MemTest86 - Official Site of the x86 Memory Testing Tool

2) SeaGate SeaTools for Windows (test ALL hard drives - HDD/SSD/USB/etc): How to use SeaTools for Windows | Seagate Support US

3) Intel Processor Diagnostic Tool: Download Intel(R) Processor Diagnostic Tool
Disregard if not using an Intel processor

4) Furmark stress test for GPU: FurMark > Downloads
Read the instructions carefully and watch your system when testing.
If it starts spitting out problems and you can't shut it down - simply turn the system off/unplug it from the wall

5) OCCT: OCBASE / OCCT
Read the instructions carefully and watch your system when testing.
If it starts spitting out problems and you can't shut it down - simply turn the system off/unplug it from the wall
Be sure to run the PSU test also.

Good luck!