Please help: My MBP freezes when not connected to a power supply.

When I am working on my MBP (specs below) without it connected to the power supply, it will freeze every once in a while. I have no option but to hold down the power button to do a hard restart – and then it takes a good five minutes to boot back up.
Does anyone know what the problem might be? It NEVER freezes when it is connected to power.
BTW – the MBP freezes randomly, *sometimes the battery will be near full, sometimes only half full,* so I don't think it has to do with the amount of power left in the battery.
Thanks in advance for any replies.

there is definitely a problem Apple must solve, i have this issue too.
here is a thread i started
http://discussions.apple.com/thread.jspa?threadID=1775557&tstart=0
my mac is still out for repair, let's see if they are able to fix it.. i am not that confident so far..

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Message was edited by: chcn

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Please help: My MBP freezes when not connected to a power supply.

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