Wakeup problems + peripherals stay powered on

Hey guys.

Ever since I rebuilt my PC with an ASROCK B550 Phantom Gaming 4 P1.40 (and some other compontents like new RAM, Ryzen7 Processor etc.), I'm having two different problems, which I suspect are connected:

1. Wakeup
When I put Windows to sleep, it doesn't stay asleep. Instead, it wakes up again after seemingly random times between 1-5 minutes.

• I disabled the "Allow wake timers" option in Windows power settings.


• I disabled all wake options in BIOS:
  
  • Suspend to RAM - Auto
  
  
  • Deep Sleep - Disabled
  
  
  • PS/2 Wakeup - Disabled
  
  
  • PCIE Devices Power on - Disabled
  
  
  • RTC Alarm Power on - Disabled
  
  
• When I check Windows Logs for the wake events, it says "Wake Source: Power Button", even though no buttons were pressed. This is why I think it's a problem with the motherboard.

2. Peripheral power
When I turn off my PC, my Keyboard, USB-Hub and Game Controllers all still have power and light up my room like a jazz lounge.

• I deactivated the "USB Power delivery in Sofft off State (S5)" option in BIOS.


• I disabled onboard LED in S5.


• The behaviour is inconsistent. Sometimes, the lights stay on. Sometimes they don't.

Any ideas what might be the problem? Is this even a motherboard problem or do I need to look elsewhere?

Thanks in advance.
dervonnebenaan