<p>For the record, I did have an autofocus problem with my 24-70. In autofocus mode, it began "hunting" for focus - all subjects, all shooting conditions, all of the time - on two different camera bodies. My results were much worse than what the OP is experiencing, so it was obvious there was a problem. I finally sent it back to Nikon, but they did not make any meaningful notation on the repair ticket what the problem was - something like "Factory Adjustments". Haven't had any problems since.</p>