Ok .. guy in our vette club was havin similar issues and after a bit of detective work figured out that his wife was keepin the keyfob too close to the vette so it was arming-disarming the system pretty much 24-7 as she walked in and out of the house within range to trigger the arm-disarm on her daily errands.
It was runnin the battery down after a few days both in the keyfob and on the car.
Problem was solved by turning off the 'passive' alarm function on her keyfob.
Dunno if Camry has a passive arm-disarm function, but if it does and you keep the keyfob at borderline range of effect, it will cycle arm-disarm apparantly just for laffs

-GE aka Frank (and btw .. did I mention that was a *nice* Challenger

..get so caught up and then distracted sometimes I don't finish sayin what I wanted to say
