So in an act of gross stupidity I connected a 12V supply to the USB Hub my P2, P12, Kemper and SY300 were attached to.
The Kemper and SY300 survived but the P2 and P12 both have USB problems, not sure if there are other issues yet, they both seem to work and midi seems good.
So I have opened the P2 to have a look, part of the PIC32 seems to be melted right near the usb pins so I guess some of the internal traces got a bit hot.
The PIC32 seems to be running ok though as the rest of the synth seems fine.
Next to see if the P12 is the same...