alarm unit was acting funky. It went off with a weak sounding alarm sound. I opened the door manually and tried to start the car but couldn't. I disconnected the battery, reconnected and it stopped. I read on the forum from other owners that the alarm siren unit has batteries and when they start to go they leak on the printed circuit board and that makes the unit act weird. So I replaced it and my issues went away except for this occasional alarming for no apparent reason.