I had something like this going on for a few days. I just used rubbing alcohol on a Qtip to clean the trackball. No disassembly like I would have done to change the trackball for a new one. Just wiped the trackball with alcohol soaked Qtip, roll it a bit, wiped, rolled, wiped... Let it dry then turned it back on. Worked fine... If I keep the 9000 for awhile I guess I will eventually have to take it apart and replace the trackball. For now, it is working as good as when it was brand new.
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