Evening all, bought a 2nd hand RP245 recently and all going well, no problems with it so far except for one little annoyance. When i close the back door and start making the next bale the buzzer and the message for back door open keeps flashing/beeping up. It will keep doing this for about 20 or 30 yards down the sward. Anyone have any issues with this before? I have checked the sensors above the locking hooks and all seems to be set to recommended gaps.