Macbook loses keyboard and touch pad

My old, white Macbook, early 2008 model, 2.4 GHz, 2GB RAM, loses access to the keyboard and touchpad on a random basis. It usually happens after the machine has not been touched for a few minutes. It does not appear to have any relationship to the power saving options though.
So far I've reset NVRAM, repaired permissions, and reset the SMC. No change.
Attaching an external keyboard and mouse allows me to keep on working, otherwise I have to force a shutdown by holding the power button down for 10 seconds to shut it off. Without the externals, there's no way to recover short of a shutdown. Everything is back to normal on the restart.
Any other ideas short of taking it in to a tech?

Thanks for the idea.
I had taken the battery out as part of the SMC reset and it was fine, though it make me wonder if there could be a heat relationship. I've had intermittent problems like this with Windows boxes when heat caused connectors to gradually work their way loose. As temperatures go up and down, when the fans run, it could cause a brief connection loss. It wouldn't have to be much to lose it. Don't know how Apple configures its hardware, but one brief glitch could cause permanent loss during the current session. Interestingly, it never happens when I'm typing or using the trackpad.

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http://support.apple.com/kb/ht1379
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