It might be related to the battery connector/sleep switch. I'm trying to remember whether I had that issue when mine was mis-seated. Could be a heat sensor. There are other, more expensive possibilities (logic board failure is the main one). If the problem persists, I would suggest taking it to a Genius Bar if there's one near you, and if they can't help because it won't replicate the problem in store, take it to an independent repair shop for diagnosis (this would be about $60, probably) if you can afford it.
I would also suggest making sure you're backed up, in case it is a sign of an expensive problem that requires sending the computer away for repair, or makes getting a new computer look like a better idea (if it is the logic board, at this point you would probably be better off getting a refurbished computer in a newer model, or even a new computer).
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Date: 2011-01-13 19:06 (UTC)I would also suggest making sure you're backed up, in case it is a sign of an expensive problem that requires sending the computer away for repair, or makes getting a new computer look like a better idea (if it is the logic board, at this point you would probably be better off getting a refurbished computer in a newer model, or even a new computer).