Driving in a subdivision at about 20 mi/hr and the passenger headrest AHR deployed for absolutely no reason and without warning hitting the passenger sharply in the back of the head. Looking at the unit it appears that the plastic component holding a retention pin gave out releasing the pin which was still in the grip of metal claws so we know the solenoid didn't accidently activate. The plastic simply broke!! Fortunately it didn't result in injury other then a sore head! There are a lot of reports of this happening with these headrests so it is recurring problem which I'm surprised hasn't been addressed yet. If/when the drivers side does the same thing it could result in an accident causing situation.