I am not sure it was the problem with the camera, but with the lens, I guess it was auto focus wasn't it?, the problem with auto focus is sometimes the focus is not at the right point. I prefer to use manual focus to auto. As long as the photo is sharp you always can crop the frame for closer look and that is still okay to get better look of the object, I am not the expert on such thing too. if you can find service center, it will better to check with the expert.