It is NOT the peel-off white membrane in the link above. Yesterday, I swapped the keyboard (rubber and plastic) from my 9700 to my 9780 in 10 minutes. The problem is now gone. Anyone suggesting it's an OS issue has another issue - but not this issue. Every single issue like this, except one in this thread, required a unit exchange, not software, from what was written here. I'm not sure - but I suspect it has to do with the rubber density on the keypad not being up to standards and wearing over a short time. Mine went bad after only 3 months, yet my 9700 withstood 8 or more, till I taught it to swim, unsuccessfully I may add too...
When I opened my BB and closed it back up, there was NO evidence that it had ever been opened. If you're careful - it comes out perfect, but the operation isn't for the faint of heart.
This is the part -
http://www.truesupplier.com/oem-blac...-pr-18923.html