I am deeply disappointed with this mouse that microsoft developed. I'm going through the same problem in scroll and there is no way to solve yet. Nowadays it is difficult to find any equipment that actually works as expected and as its price, especially when it comes to big companies like Microsoft. This is sad, very sad.
Replace the faulty mouse with a new one is impossible because I won this as a gift and I do not have the invoice anymore. I've had XBOX with 3RL after a few months (I bought a PS3) and this mouse with scroll problem (I'm using a logitech now, because the problem in scroll really annoys me). If I plan to buy microsoft products and praise? I do not think so.
Eduardo Valentim