A few weeks after purchasing my 2004 kia sorento, i noticed the drivers seat rocking back and forth when accelerating and braking. dealer replaced seat rail. that failed to resolve problem. since then the dealer has again replace the seat rail and the whole seat without resolving the problem. kia rep says that it is normal for electric seats in kias to rock like mine does. i believe the seat will eventually fail during an accident rendering it and the seat belt useless.*ak