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Sep 15, 2016 12:26 PM in response to acbartby lllaass,Likely a loose connection.
Does this happen when on AC power? On battery power? Both?
I suggest you make an appointment at the Genius Bar of an Apple store.
Apple Retail Store - Genius Bar
https://www.apple.com/retail/geniusbar/
This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.