Why does my macbook pro shut down when I close it?

For about a week, SOME of the time when I close my lid, my laptop will shut down. It doesn't happen all the time, maybe about 50%, but when it does I have to hold down the power button for about 5 seconds, and then let go, then hold it down again for about 15 seconds to get it to turn back on. Has anyone else had this problem? I've had this laptop for coming up on 2 years.

Reset your SMC, as described here:
http://support.apple.com/kb/HT3964

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  • MacBook Pro shuts down when i close the lid

    Hey,
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    It started to do this one or two times, but now it is every time.
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  • My macbook wont shut down when I close lid, how do I prevent this?

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    Disk Sleep Timer (Minutes): 10
    Display Sleep Timer (Minutes): 10
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    Wake On AC Change: No
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    Wake On LAN: Yes
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    First low level warning: No
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    Remaining Capacity (mAh): 2994
    Amperage (mA): 0
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    Cycle Count: 41
    AC Charger Information:
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    Charging: No
    Hardware Configuration:
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