Eather way, both Laser Mouses and Ball Mouses (or a Trackpad) will jerk out. If you're using a Laser Mouse, rub your thumb or index finger (that's what she said) on the Laser, there's probably dirt on it. If ball, just roll it around until you see dirt, if there is none, it's something else. For Trackpads, they just do that. My laptop will go to Zoom when I move it.