Windows 25H2 update – S3 sleep mode compatibility issue

It appears you're facing issues with the sleep mode on Windows 11, specifically with regards to the S3 sleep state and network card signal detection. The problems you're experiencing, such as the computer being woken up for no reason and the sound card experiencing a long silence after waking from sleep, are indeed known issues affecting some Windows 11 users. These issues might be related to the compatibility of Windows 11 with certain network cards, particularly those with 2.5G network capabilities, as you mentioned.