To help isolate the problem, hook up to an external monitor and see if it goes down when this happens.
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Here's some information on a possible class action law suit and a link to an SMC Update that Apple released to possibly solve this issue: http://9to5mac.com/2013/03/14/15-inch-retina-macbook-pro-software-update-released-with-graphics-fan-bug-fixes/
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Keep records of any expenses you may incur when trying to resolve this issue as your costs may later be recoverable from Apple.
To help isolate the problem, hook up to an external monitor and see if it goes down when this happens.
+
Here's some information on a possible class action law suit and a link to an SMC Update that Apple released to possibly solve this issue: http://9to5mac.com/2013/03/14/15-inch-retina-macbook-pro-software-update-released-with-graphics-fan-bug-fixes/