Hello! I recently bought Mario Paint with an SNES Mouse. It was all working fine when, suddenly, while moving the mouse over the Y-axis, the mouse would become jittery and skip along the screen. I tried cleaning the ball inside and the rollers, but to no avail. So I tried moving the rollers with my finger. The X-axis worked fine, but the Y-axis still is jittery. Something must be wrong with the one roller. Any help? EDIT: Now the Y-axis just moves very slowly.