Sometimes the mouse wheel just stops working on my vx revolution, I spin it round and round and it doesn't register, then after a few seconds it starts working again, as if it was stuck, what is it with logitech and scroll wheels? I have seen so many logitech mice with scrolling problems it's beyond belief. On my last mouse the wheel became increasing difficult to move over time and then stopped moving at all, it looked as if the rubber scroll wheel had become deformed.