My camera is now to the point where the auto focus will only work occasionally. It hunts for focus now a lot. I've taken to using manual focus till I purchase another body and I can send it in to Nikon for repair. On the plus side, it's been good and advancing my photography technique to focus manually.
I'm the original owner, and the camera has been babied. I just think it's one of those unfortunate things that happens with age. Of course, that's not saying the problem exists with your camera.