Mousepad-problem - clicks are not registered

Hello,

I have a 6 month old Late 2008 MacBook Pro 15" and about 4 months after purchase the mouse-pad developed a clicker-problem. A normal, standard (quick, not-too hard) click stopped being registered and required a much harder and somewhat lengthy click every time. Double-clicks started to be a bigger problem and general internet surfing began being annoying due to the repeated clicks required as and when I wanted to perform an action. I took the MacBook to an Apple-dealer who opened the back and apparently did something to the mouse-pad which made it function normally for a bout 3 days after which it reverted to being annoyingly difficult to use.

Has anyone out there encountered the same problem and can you help?

Many thanks in advance.

Vuk