Very strange problem, I know some other users have the same issue that the coding key knob has only Volume+, but I can’t copy this problem on my side, so have no idea but a hanging issue.
And do you have a multimeter to test the coding key knob? Test and see if the 2 PINs are not short to GND in normal condition, and see if it can be short to GND when rotate.
The coding key knob should have no connection with the USB part, the only reason I could imagine is that the PINs are short to GND and cause some problem on power.
And another point to check, try switch to USB mode and see if it recovers.