My D800 quit auto focusing about five days ago using a 50mm f1.8D and 24-50mm f3.5-4.5D. After checking my focus settings and mounting a 24-70 "G" series lens it began to auto focus again. Today (during a shoot) it failed to auto focus with a 16-35 "G" lens. I registered the camera with Nikon on May 7, 2013 so it should still be under warranty...more later.
"Great things are not done by impulse but by a series of small things brought together." Vincent Van Gogh