Had this
problem and it was fixed by the dealer....I assume it was done under warranty....I didn't pay for it anyway
You could feel the metal frame on the outside of the seat (although the seat cover wasn't worn) and the dealer replaced the seat cushion/padding in the base of ther seat. TBH it's not a lot better......must be my svelte-like physique
although in my defence I've had a number of high performance cars (including a Mk 2 GTI and a VR6) and never had a
problem with the seats up to now.