Received the 2006 Zephyr as gift. First occurrence of problem -- sunroof and front windows open, doors unlocked, possibly trunk unlatched as well -- August 2013 while traveling. Found everything open in morning when we came out after a rainstorm. Luckily the car was under shelter so minimal damage. Nothing missing from interior. Second time a few months later, at home. Third time was today, after we had parked the car in garage and gone inside. After the second incidence, we had the car checked, but the mechanic found nothing. Suspect a transient short-circuit somewhere in the system, but would like the problem diagnosed properly and corrected before we suffer a serious loss.