Ugh, my new gaming mouse I got from my friend came in today, and it is not working well. It looks really cool, yet when I move it to the left, it speeds up. then, when I move to the right, it moves slow, if moving at all. I don't know if there's a way to take it apart but this upsets me a lot.

Is there something like an hair in the sensor hole ?

That happened to that guy. http://forums.logitech.com/t5/Mice-and-Pointing-Devices/V450-mouse-different-speed-for-up-down-vs-left-right/td-p/852106