2.5 y/o macbook develops random shutdown?

Hi,
my 2.0 ghz core2duo white macbook has done the random shutdown thing 2 nights in a row, and its never happened before. no warning, no prior indication, it just instantly shuts down. I haven't heard of this developing on an older macbook. Both times the computer was under light load, on battery power and had maybe 20% charge left.
I did see one thread where on old battery may be an alternative cause, so I downloaded the suggested coconutbattery, which tells me my battery has a capacity of 4036 mAH now, as opposed to 5020 when new. I don't know if this is significant but it doesn't seem that 80% of the original battery capacity is too bad.
Does anyone have experience of this happening, or any helpful info for me?? This is a pain as I was hoping to use my macbook for some live music soon... not too confident of that now.
thanks, Simon Gregory

I'm not sure resetting the SMC is good advice, according this article:
http://support.apple.com/kb/HT1894
It says only to do it very very specific issues, and random shutdown is not one of them. The article specifically warns against doing it as a troubleshooting measure...

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