Not "Freezing" - Just Turns Off!  Anyone Else?

Only noticed it recently. The unit just goes black and shuts down! Happened once while surfing and a bunch of times when I've gone to use it when it was running the screen saver - just shuts off. I press the power button and it powers back up normally. Called Apple Care and the tech walked me through a bunce of stuff (unplugging, disk and HW checks, etc) and said all was fine!
I switched from Windows systems to get away from problems - this is very discouraging! Any ideas?
Mark

Seems you are the latest member of this frustrating issue. I am having the same problems despite doing all the Apple suggestions. It comes and goes and has no direct relation to any particular program or task. It is driving me NUTS!
I've had Apple products for at least twenty years and nothing has happened that couldn't be resolved with a phone call or two.
btw I also installed that SMC fan control and boosted speeds a little.

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