#21. "RE: A possible bug with Nikon cameras with dual card slots...." In response to In response to 17
>I think camera is doing something else that >manifests itself as writing.
More guesses from me. Format the SD card in the D800 slot. If the problem continues, try a different SD card in the slot. Format it in the D800 and watch for the problem. If the problem goes away, it was a bad card or improperly formatted card.