Hmm don't know...like said mine does the same thing....in a split second the cursor will be at the other side of the screen, but mines PS/2...can't stand USB mice
My logitech optical mouse used to do that that all the time on my old computer. It doesn't do it anymore on my new computer that I have noticed. I'm not sure if its just coincidence or not, but on my old computer I used a USB-to-PS/2 adapter, and now I just run it right to the USB port.