Nope, it is doing it with the PF lifted. It can be fine, can knock down a whole bank of targets without a problem, then it can return. Bashing the PF can start or stop it, but I can not find a reason for it. Could it be a contact in the score motor contacts? When its scoring that thing turns around, and has blue sparks on 2 different sets of contacts. Could it be that the motor is not allways getting the message to stop?