When the onboard flash is down, if I rotate my D800e I get a rattle from that area, almost as if a weight is moving up and down. With the flash up, the camera doesn't do this. It sounds a bit like the aperture lever on a TC 17II moving, noticeable but quieter. All appear to be working correctly. Does anybody elses do this bearing in mind the camera is three weeks old? What's your thoughts on this?