Driver seat issue -- feels like a loose ball in the back and you can feel it hit the back?

[Ravim]

Does anyone have a random issue with the drivers seat where it’s feels like a loose ball in the back and you can feel it hit the back?

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[SSonnentag]

Not that I've noticed. I do notice everything I place in the center floor tray sliding forward and back if I accelerate moderately or use brakes to stop.