BLACK HAWK: My logitech trackball mouse was doing the same thing. I opened up the case and where the micro switches are i sprayed them with alcohol (alcohol is non-conductive) then i took my finger and clicked the switched about 10 or 15 times and then sprayed them again. now it works fine. the switch contacts build up a contact arcing residue, then you get what is known as the bounce effect. good luck
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