Good question. And one I am hoping more will chime in on. I was hesitant in purchasing the D4 so soon considering it's recent release but having read so many reviews that rave about it, and the need for a second body, I thought what the hell, I'll take a chance. I'm starting to wonder but I hope this is the only issue. I am also wondering if the ones released for review or to NPS members were not given a shake down before hand?