My mouse light repeatedly flickers and very often freezes up then works again. Occasionally, my computer boots w/o the mouse detected. I also get a "A USB device has malfunctioned" popup but I am definitely sure that the USB is NOT the problem, nor is it the mouse. My mouse happens to freeze most often when there is high memory usage on programs. This is most noticeable when firefox is open, where I can have up to 4 1-2 second freezes in 10 seconds. Once in awhile my mouse light goes out completely and I have to replug the USB back in.