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I know I've seen this posted before about other seats, but the search function isn't yielding posts that describe my situation.

When I accelerate hard from a standstill or in to a corner, the driver seat makes a clunk on hard turns. Its as if the seat back is loosely attached and the seat front is shifting inside the shell. Given the seats construction, I'm not sure that's even possible but has anyone experienced this. Does it warrant a trip to the dealer? It seems to be getting worse.....