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I have the latest MacBook Pro and am finding that it is randomly shutting down when switching users. This does not happen every time but has happened 7-10 times since I bought it. Should I get it checked out or is this a common bug in Lion?

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I've added an answer here that offers general guidance. – bmike Sep 5 '15 at 15:50

There was a firmware update for the MBP that addressed unexpected shutdowns...might try that and see if it solve the problem. Look here

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If this continues after applying all OS and firmware updates, definitely take it into your local Apple Store so they can have a look at it.

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