usb-audio

It sounds the same in #3. But when it occurs, it last shorter than it does in #3.
It happens with random time gap, sometimes 3 minutes, sometimes 10 minutes.
This also happens in DiscoveryF7Audio, but it has a longer gap between 2 occurrences. In otherwords, you are less likely to hear the bad sound from DiscoveryF7Audio.

Note that color