My "n" button doesn't work properly

I've just read the Macbook keyboard problems pool at Engadget (http://www.engadget.com/2007/12/15/poll-macbook-keyboard-problems-anyone/) yesterday, seemed the all famous & likeable Apple's product has it's own bad side -for some unfortunate people.. And this reminds me again that my Treo 750v has one of it's type-pad button doesn't work properly, it is the "n" button. Sometimes when pushed, the word "n" don't appear although I've pushed it rapidly; it won't appear until I pause for a second before push it again. I wonder if this only happen to me, or are there somebody else experience this too?