I have a Logitech Mouseman Dual Optical mouse that is driving me insane. At random times the pointer suddenly jumps across the screen, usually on the vertical plane. While this is not too big of a problem doing some tasks, at other times it is unacceptable (for example while playing an online FPS and I get fragged because suddenly I am looking at the sky or ground while my opponent blows me to smithereens).
Any suggestions as to what might be the cause of this?