My G9x mouse moves erratically in some situations..?

Hi there!

I just recently purchased a new computer, and along with it a brand new mouse - the G9x. Originally I had no problems with the mouse, but now I have noticed something extremely annoying. When I'm playing Black Ops 2, my mouse movement is regularly fine - no noticeable problems. However, when I go to turn my mouse quickly (as if someone is behind me) and my mouse moves too erratically for me to aim correctly.

I have tried changing my sensitivity - lower and higher - and even ensured that no mouse acceleration was enabled. The two possible issues could be my mousepad - which has worked fine in the past - or there's something wrong with the laser on the mouse.. or I'm just using it incorrectly.

Any help whatsoever is appreciated.