Intermittent door lock (continually tries to lock doors), followed by security alarm (horn off and on for a period of time). Alarm can be stopped by opening liftgate with key, but after closing liftgate, starts happening again. Happens mostly during humid/rainy conditions. Last occurred two nights ago while car parked in garage. Had to disconnect battery to make it stop. This has been going on (very intermittently) for the past several years.