Is anyone having, or has anyone had, this problem? Recently my D300 has issues with autofocus when the 18-200 lens is zoomed out past about 120 mm. Autofocus is fine on the shorter lengths. I recently sent my 18-200 to Nikon because something was rattling around inside, so I am using a friend's lens. I am wondering if the malfunction of my lens may have damaged the electronics of the camera in some way, or if changing custom autofocus settings may have triggered this problem.