Thanks for the response. As far as I'm aware I have the latest software (1.0.04.12210), and R4PC doesn't tell me there's anything more recent when I plug in.
Not sure what you mean by "soft reset": do you mean "push in the reset button with the end of a paperclip" ? Yes, I've done that. As I said, I had to do it each time to recover from the fault. Is there some other sort of reset ?
My query really was whether anyone else had to reset theirs every month or so to recover from some kind of fault. If it's just me then it looks like mine is faulty, but if other folks are just putting up with it then maybe it's a design issue and I also have to accept it.