My passenger side seat slides back and forth slightly. All electronic controls work and its as if the seat is loose on the track. It will shift forward or back freely for about a half an inch. Not so bad if someone is sitting in it, but when I'm driving alone, I hear it move if I accelerate quickly or brake hard. I can grab the seat with my hand and just slightly move it back and forth without using the switches. Does not sound like the motors in the seat are being affected by the movement. Any ideas?