I have a friend who has a 60D with a kit lens (18-135, I think) and she is having an odd problem. We both take photos of high school sports. In the last few days, her camera has exhibited an odd behavior. Through the viewfinder, the image jerks in random directions two or three times before focusing. My gut feeling is that this is a lens problem, but I want to get some expert (for Canon Rumors level of expert) advice before recommending using the lens for skeet shooting practice.