All, I just got a canon L 100-400 lens from BH. I took about 100 pictures with it the other day and I got a handfull of instances where the focus/shutter would lock up and I would get a error message on myT1i. It said something about a communication error try cleaning the contacts and try again. The camera is a few months old and the lens is brand new. I would turn the camera off and it would work again. Any thoughts?