Nikon 70-200 focus issues
So I am shooting with a Nikon D7100 and Nikkor 70-200mm 2.8, and it is having trouble focusing. I take pictures for a school, and in many different shooting environments, when I try to focus on my subject, especially when I am shoot at 200 from far away, it will focus just beyond my subject. I have tried messing with the settings, but nothing seems to be working. The lens is a little over a year old, and the camera only about nine months. I would be deeply appreciative if someone could help me out in this issue!!