What kind of usage has it had? I mean if you've had 50,000 actuations then I'd sat it was just wear n'tear, but if you'e only taken 5,000 shots (approx. 1,000/month) which would be normal (but still high use) then I would have to say there might be either a design flaw or your specific body is somewhat defective. Or alternatively, you're throwing the camera around e.g. into your car/boot without keeping it in a padded case (unlikely though given the cost).
