So I've been using a razer naga epic mouse for quite some time now, recently the cursor started to move on its own, so I figured it was broke, and time to get a new one...so I did, and this one did it as well, took it back to the store and replaced it.
And this one is doing it too...

Now, recently I opened my PC to clean it out, is it possible I bumped something which could cause this to happen, or is it just really bad luck with the mouse? (Contacted razer, said there's nothing that they can / will do)

Thanks for any help!

Edit: yes firmware is all updated