I agree that it happens to my DH more often than my other classes. I've noticed that if I have Tactical Advantage skilled, and I'm Vaulting my way through an already cleared area (covering a large amount of distance very quickly), I will usually rubberband somewhere in the middle. Perhaps the server is unsure how I'm traveling so far and resets me?
Demo: http://www.youtube.com/watch?v=v6OQUGvWb08