At times my mac starts typing on its own and the only way i can stop it is to disconnect from power source. any suggestions?

This is my first Mac, so I am not sure if I have missed something along the way. I really would appreciate any suggestions.....

Hi Chris, did you solve it?
I only ask because today, for the first time, I had the appearance of a stuck key for a couple of minutes but I don't think I was even touching the keyboard, I suppose it could conceivably have been caused by a rogue biscuit crumb or something, but coincidentally it was the same key that you reported, the period key typing..............................................................
There's some related problems here:
https://discussions.apple.com/message/20002058#20002058
https://discussions.apple.com/message/19765286#19765286
David
(Imac with wired keyboard, OSX 10.8.2)

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