So despite having been an electronics technician in a previous life I neglected to make sure that the phase wires weren’t going to rub against the motor and eventually short out. It took a few months!
As soon as I got home and tried connecting the VESC to my computer I realised that I had in fact killed the VESC (i.e. the USB controller/hub wasn’t working).
I have a replacement VESC, but I shouldn’t have anything to worry about when i try hooking it up again should I?
(note: I have replaced/repaired the phase wires too)