Trackball clicks not responding or double clicking sometimes

Hey guys, my 8900's trackball started acting funny lately. Sometimes when I click it does not register at all and I need to make a more deliberate click to register; or I press the trackball in and it double clicks.
My question is, if I purchase a trackball replacement should this fix the problem or is the problem more with the PCB board sensor? Rolling action in all directions is fine.

The problem is the trackball push-buton contact that sits underneath the trackball. It gets sticky and less efficient which causes the double-click affect. This contact isnt part of the trackball itself.
The good news is that the contact membrane (sometimes called the "dome") is replacable; is kinda an orangy film membrane sticker, and has a metal contact in the centre. Replacements are availble from ebay and other online stores.
There are youtube video guides that who youhow to replace the membrane - not all models are featured but the process is the same. You need to be confident in dissassembling your BB to get to the contact though.
I replaced mine on the my BB bold - problem solved.

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