Question PC Sleep Issues

[An Arable Hill]

I'm quite stumped here. The issue:

• Sometimes when I put to sleep the OS appears to be completely asleep, but the computer power remains on for several minutes. When it wakes, it will be a fresh boot.
• Other times when I put to sleep it won't wake up with the power button. I have to turn off the PSU power switch until the lights go out on the motherboard and then turn on with the switch. When it does come back it's as if it was just asleep.
• Sometimes it works as it should.
• None of these issues are reliably replicated.

Specs in signature. Windows 11 up to date.

 

[RLGL]

Did it work correctly with Win 10?

 

[An Arable Hill]

Windows 11 has been working fine for months. I haven't run this hardware on W10.