A problem near my macbook?

Hey, I hold this problem with my macbook, sometimes it only just shut down with out a use, the battery is full and everything is ok, but it keep shuting down
Can somebody help me beside this?
Thanks

Answer:
A first generaton MacBook will have a Core Duo processor contained by it. You can find this out by going to Apple Menu-->About this Mac.

I would try running Software update
Apple Menu-->Software update

The problem might be that you need to update the SMC firmware on your computer, which be the root cause of copious random MacBook shutdowns slowly last year. According to Apple, the updated SMC firmware they released fixes most of the shutdown issues next to MacBooks. If this does not work, you should probably take it to an Apple store or bid Applecare. Hope this helps.
Is it a first classmates MacBook or second? If it's a first, there be a firmware update that fixes this problem.
Run Software Update that's in System Preferences and install any firmware upgrades if it list any. Call Apple if it's still under warranty.

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