how long have you had it mate? I had this very same problem with my arrow keys. So I took off the fascia, removed ALL the keys and cleaned it inside and out. made a hell of a difference, apart from looking better than it did out of the box (all the keys are polished shiny by typing
) the key action is smoother and more reliable. Took me about an hour, but then I did do a proper work-over on it. I removed a ton of crap from it - if you eat at your computer it's gonna be full, no matter how careful/tidy you are, plus little bits of skin from touching it and a suprising/shocking amount of hair...