cannot update 20H2 build 19042.662 for last 2 months

zbook said:

High on the list is the CPU.

This is the first of 3 different software to stress test the CPU.

Other tests may test GPU, RAM, Drive, PSU.
There are no software tests for this motherboard.

To monitor for unexpected shutdowns and restarts please use:
Reliability Monitor is the Best Windows Troubleshooting Tool You Aren’t Using

Thanks much, was not aware of that Reliability Monitor.