My SB600 was dropped on the floor from some bleachers in a gym and now the zoom function zooms and shows the length, but after a couple seconds it shows a couple dashes. Also when it is left on for a few minutes the batteries get extremely hot. I tried to fire it once with the camera and it seemed to work ok. I am wondering if Nikon repairs these and if anyone has any ideas on how much to get it repaired. I really don't want to try it on the camera again and possibly fry the camera.