MacBook 2009 shutting down / crashing unexpectedly / suddenly - Mavericks 10.9

Hi,
My MacBook mid-2009 shut down unexpectedly a couple of weeks ago - it had been running for a while and was very hot to touch - but in the past few days it has been happening more frequently - I counted about 12 crashes/shut downs yesterday and I'm getting testy!
I tried the SMC reset mid-yesterday but of course another 5-6 crashes happened following that.
I've searched through various discussions - some say that it's to do with Mavericks, some with the SMC update - I tried to update the SMC but it doesn't need it apparently. There's also a suggestion to put it in "Safe Mode" that I found...
Does anyone have any thoughts on other solutions please?

Third party apps may be causing this.Wipe out some of them and try restart.
This isnt terribly likely, but its worth a shot: shut down your mac. Start it up and immediately hold down command+option+P+R. Let the Mac chime two times and then let go of the keys. This is known as `zapping the PRAM`.
Cheers,

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MacBook 2009 shutting down / crashing unexpectedly / suddenly - Mavericks 10.9

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