The active headrest on the driver's seat deployed spontaneously on it's own during normal operation of my vehicle. The headrest is now unable to be reset as it appears some components of the active headrest mechanism were faulty. This put my safety at risk as a driver as the active headrest can not activate in the event that it needs to activate during a possible collision. The headrest and seat causes strain and injury to my neck while driving as it is now positioned forward from the seat. This also causes strain to the rest of my spine. This issue is not covered by the original dealer that sold me my vehicle. There are no warning lamps or messages that have appeared since this problem first occurred.