driver's seat problem
 

Has anyone had this problem? My drivers seat on my 98 GLE occasionally moves a little bit during acceleration or braking. It's not all the time, it seems to do it when I brake a little hard and then accelerate. It's not a big move just enough to feel it 'slip'. It's as though the power motor is slipping. I usually hear a little noise when it moves also. Any feedback is greatly appreciated.