New Envy Windows Freeze

[Alex6789]

My newish Envy 360 periodically slows down dramatically, almost freezing and with the fan turning loudly.  Restarting the PC puts things back to normal for a day, then it happens again.  Started last week, after the latest Windows update

When this happens:

- no unusual tasks in Task monitor

- Performance monitor CPU, disk, and memory indicators are all less than 50%

- No unusual events in Event monitor

- No other programs need be running

- It can take 30 seconds to switch from Task monitor to Performance monitor

What I have tried:

- Windows defender scans, both regular and offline (nothing)

- unplug peripherals

- uninstall unneeded software

Suggestions appreciated

[WAWood]

@Alex6789 

You mentioned Windows Update -- so we need to know which specific Windows build you are running.  To find out, enter "winver" (without the quotes) in the Search area and report back what shows in the Window.

[Alex6789]

Windows 10 version 20H2.  Build 19042.928.

Thanks.

[Alex6789]

This loud fan/computer almost freezing behavior continues sporadically.  I have not found a solution yet.  What I noticed today is that while Task Manager/Performance Monitor both report CPU usage in the range of 10 - 20% while this is going on, the temperature monitor CoreTemp reports 90%+ loads for each of the cores in the Ryzen CPU.  CPU temp is reported as 25 degrees C.

Any thoughts or suggestions would be helpful.