bpr2000

Hi all, I have a bullet proof 1996 Camry wagon. It has a weird problem that when I park it in the sun on a hot day (Perth, anything > 30 deg C) the car alarm plays up. I can open it with the keyless entry, but when I go to lock it, the doors will lock and unlock quicky 5-6 times and the car alarm will go off. Im guessing its a sensor problem somewhere in the system due to the heat factor, but would love to hear anyone who has kicked this problem themselves. Thanks in advance, Brendan