Raptor M45 moves on its own

I recently bought a Raptor M45 mouse. I really like it, but I've noticed that a lot of times, the mouse will move on its own. It doesn't happen often, but it does. The mouse pointer will move in a steady direction, fairly slowly. The direction seems to be random.



I'm using the latest drivers and firmware on Windows 7 64-bit, on a Ratpadz XT surface (textured plastic surface).



Any suggestions?