No real event leads to this failure. problem is the "door ajar" light on the dash. it detects whether a door is partially open. the switch in one of the doors fails for no reason. when it senses this falsely, the dash warning light comes on & beeps a tone & quite often the interior dome lights turn on. the dealer says to lubricate the door latches & work them several times. i've done that many times & it does not help. when the switch fails & the light comes on, it may be brief but other times, i'll park the truck & walk away & the light remains on for quite a long time. i'm sure i'll come out to a dead battery one day. please check this out. i have seen hundreds of other reports like this on the internet - for various ford model cars & trucks. the light coming on is very distracting and could be dangerous. *tr