Comment by CamperBob2

You run memtest86 to rule out a RAM issue, then check with your system reseller or mobo vendor for BIOS mitigations for the latest round of Intel CPU bugs. If you are able to rule out the RAM and CPU, try a different power supply. Failing that, the motherboard itself may be causing the issue.

Unfortunately there are few good ways to narrow down intermittent hardware failures (which is what you are experiencing) beyond these common steps.