My D800 has an error message when I shoot above f8. I have tried several lenses and get the same error. I was recently on the beach for a ceremony and have since cleaned my camera. I don't think I have sand in there and can't figure out what to do. When I shoot closed I have to manually press the shutter release after each shot. In video mode, it'll work if I start at f2.8 with my 24-70mm and move towards f8. If I start at f8+ it gives me the same error. Any clue?