This began after recent Windows updates on February 16th.  Per Microsoft:

The MICROCODE_REVISION_MISMATCH bug check has a value of 0x0000017E. It indicates that one or more processors in the multiprocessor configuration have inconsistent microcode loaded.

Cause

One or more processors in the multiprocessor configuration have inconsistent microcode loaded. This bugcheck indicates that faulty system firmware has mistakenly applied a microcode update to only a subset of processors in the host configuration. System firmware must apply microcode updates to all processors in a uniform fashion.

When this occurs the system behaves like it is waking up from hibernation or sleep (whichever I have chosen) and the system then behaves like it has been forcibly put back to sleep.  Power light is flashing as if the system is in sleep but the machine will not wake unless power is pressed at which point the system comes on but anything left open has been lost.

System is stable as a rock otherwise as it has been since being built over two years ago.  Runs through CPU benchmarks without issue..  I don't have the recent update that seems to have caused problems for many (KB4524244).  I did, however, have KB4532693, KB4537759, and KB4538674 installed on that day.

Anyone else having this issue?  I know the latest go of Windows updates has been particularly problematic for some Ryzen users but Googling around I've not come up with this outcome being encountered by anyone else.

System specs:

Solved! Go to Solution.