Just a thought here, but it might be dirt or lint and not a broken track ball. Do you carry the device in your pocket?
To fix (if that is the problem) turn the device off. Then press and roll the trackball, first in the direction that it doesn't work, then roll in all directions for about a minute. You can also blow some "canned air" all around it. Turn on and see if that fixes the problem. My guess is that it will.
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