I have FOUND the FIX. After trying 10 over suggestions and none of them work, this one suggestion hidden among many suggestions finally works. It is simple and the rationale makes a lot of sense.
The FIX
- got to settings > systems > power
- under Power mode change this to Balanced
And you can now enjoy leaving your computer idle.
Rationale
This problem only affects destktops because laptops/notebooks have a battery to buffer sudden demand of power. And this happens when Win11 tries to put you into sleep mode.
Of couse, another approach is to set sleep to Never. I did both ;-)
For those who are suffering from this issue, please reply to confirm if it works for you. And please state if you are using a desktop or laptop. I would like to confirm if my observations are correct.