I have a mid 2008 MBP

Macbook Pro 2.2
2.16GHz, C2D
OSX 10.7

I have had this issue for quite some time: Sometimes a few keys are not responding. Just a few minutes ago it was the left command key and the period. a few days back the '='. After a while it would just com back.

Usually not a big deal and often I work on an external keyboard. Lately have have been using the MBP more as a laptop though and in that case this is getting a bit annoying.

I'm wondering if it's a software thing? I'm usually not doing much at just notice a while later that it's working again. I have never spilled liquid on it. The MBP is working great otherwise.

Anybody else experienced something similar?

Thx in advance!