Its very annoying especially when your in the middle of doing something suddenly your mouse turns off maybe 10 seconds and on again. I already changed the mouse from ps 2 to usb. Tested the mice in another computer with no problem. Even bought usb to ps2 adaptor, still the problem persist. OS is Windows XP SP3. Any kind hearted istoryan who knows how to fix this kind of problem or had encountered and fixed this problem, please share....