I've just come home from an event where I took about 200 pictures with my D70. I noticed during the shoot that the first 7 pictures I took were missing, even though I'd seen them on my LED after each shot. Then when I got home and downloaded all of the images to my computer, I found the last 5 shots I'd taken (and seen on the LED) were also not there. What's with that? This has never happened to me before, but my camera is new enough I'm not that familiar with things which might go wrong. Any one experienced this problem before?