Hi I had this problem whilst under warranty Yhey rplaceda ll the sensors internal and external and it never stopped the problem Eventually the faults was traced to the central locking system. The tailgate wasnt locking properly and was foling the car to thinking it was being broken into when the circuit failed. They fitted a new boot lock and some of the door locks and it was all fine after that. One indication of boot failure is its ability to unlock on the move and every time you go over a bump the watning bleeps that the door is open. (Not always thought) It took Citroen 3 months to figure the problem out so I would eliminate these first Good luck
