I have a 2006 VW T5 Camper built by Westfalia on a caravelle base. The tailgate has an electric closing mechanism. Two days ago, when the tailgate was opened the latch on the vehicle body (as opposed to the hook on the tailgate) started to move in and out of its own accord accompanied by the whirring sound oif the electric motor. Today the latch has moved to the in position and thus the door will not close or lock. Any suggestions as to how to resolve this malfunction would be appreciated. I am not particularly technically minded. (Will the tailgate lock using the key?) Thanks.