Front Seat Head Restraint problems of the 2008 Hyundai Azera

Car is locked, parked and no one is in it. The back reclining portion of the drivers will move towards the steering wheel by itself. I will move it back to position and begin to drive. The seat will move on its own toward the steering wheel, smashing me. I had to remove the headrest just to have some room. I will keep my hand on the seat controls and try to move it back into original position. Sometimes this works but most of the time will not let me move it. While this is going on, my seat belt is also getting very tight and uncomfortable. Several people have seen this happen and some have seen it while no one was in the car. The back of the drivers seat just moves toward the steering wheel. I am afraid to drive this car. If I cannot get the seat to return to position I am up against the air bag, which also scares me. If I had an accident while all this is going on, (and this is very frightening for me), the air bag would deploy and it wouldn't be good, I am sure. This is something I hear about on the news, air bags killing someone. I really need some assistance with this problem. This is a very serious and possibly dangerous situation. I would appreciate your help.