When I assembled the uConsole, the trackball did not function. I removed the trackball and discovered that the ball was stuck to the metal housing. I pressed down firmly on the ball and it broke loose from the housing. I cleaned off some glue on the ball with my fingernail and reinstalled the trackball. It works fine now.
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Yh i had an issue like this, its mainly to do with dirt or dabree getting into it which stops the sensors from reading it. You can carefully take it a part and clean them (only tool needed is some fine tweezers) or just buy a new trackball.