mine used to do that, I got new seats, the motor meachanism was broken. . .the Ford dealership made me feel fat, said they'd never seen that. . .whatever, their quality build sucks. . .I got recaro's instead, lightened the car by about 50lbs, and comfort is second to none. . .cost is obscene, but it pays itself off since Ford quoted me nearly $800 to do the "fix up". . .if covered by warranty, then have them fix it . . . .because it'll be rewarranted for another year from them. . .check out my profile for pics.