hi. i think my optical mouse is broken. it’s still working, but not always following where my hand is going. i suspect that it’s either because i lost one of those white plastic pads on the bottom of the mouse and so the lamp isn’t perpendicular with the surface or my crummy free mousepad is too frayed. i’m hesitant to replace my mouse because if i did, i would get one of those cheap < $20 mice that are made by logitech but don’t say logitech on the front whereas mine says logitech on the front right now.