Intermittent missing keystrokes on macbook pro keyboard..hardware/software?

I have a mb pro 2ghz core duo and have recently been having keyboard problems. Intermittently, my keyboard will not recognize keypresses from the following keys:
zero -
p
; return
Sometimes when I reboot they work. I have to carry an external keyboard with me on the road otherwise I can't use the laptop. Do you think this is a software or hardware issue? When I use Cmd-S at startup, I boot to the root prompt and things seem to work at the command line interface. I type reboot to get into os X gui environment, then its hit or miss. I hate to send in my mac for a software issue and wish someone could shed some light on this for me.

Search "keyboard delay", "keyboard sleepy", or "missing keystrokes" . At this moment no fix. Just a half worarround.

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Intermittent missing keystrokes on macbook pro keyboard..hardware/software?

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