all windows open sometimes on their own, when car is parked and locked. (vw golf mach tdi (105) 1896 CC, MK5) VW dealer stated this is not a fault, and not to keep finger on the button of key fob for too long when locking the car, I thought it might be pressure from other keys on the key ring against the fob button, so in the past few days have decided to keep all other keys seperate from the VW one, and will moniter the situation. any suggestions please ?.