Glorious model D sensor not detecting movement

So, I had the model D mouse (wired) since it came out and recently (for the past 2 months) the sensor has been slowly stopping to "sense" and not it completely stopped. It still shines, clicks etc but doesn't move. I always cleaned it, never banged it and other stuff. The sensor only works when I put it on the edge of my table or on my knee, when the surface gets inside the senor.
Is it fixable or should I get a new mouse?