While I haven't experienced this particular problem myself, if it's a design defect rather than something caused by normal wear or damage, it should be covered under warranty and I wouldn't hesitate to send the camera in.
Looking at the design of the body, my guess would be that the thumbrest padding/trim attached to the metal chassis might be coming loose? It's quite unlikely that the chassis itself has a fracture, though who knows!
Edit: based on
this post in Mark's link it could be as simple as loose screws!
Adam
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