Can anyone give me your ideas on why my new 2009 Cayman S car alarm goes off while parked in my garage? I locked the car doors, which I understand automatically turns on the theft alarm, but there was no one in the garage with the doors down and we had been in the house for over an hour. This has happened a number of times so I have stopped locking the car. This has stopped the problem except for the fact that when I go away for a week I do want to be able to lock the car and not have to worry about driving my neighbors crazy. What do you think?