Do you mean you might used it on you lap rather than the desk and have changed the angle of the mouse? It will be the lazer, (if changing the angle of the mouse works). Disruptions occur with the lazer, hey they don't wear like a ball mouse does. You can have it repaired, just have to decide if it is cheaper or easier to just replace it. (Tip, don't leave it in direct sunlight when you are away from the computer. It shortens the life of a lazer mouse).