I have a late 2013" MBPr 2.6/8/256 Just now, it completely went black. At first I thought, "Oh, I must have run out of battery" but then it immediately restarted to a white screen and said "Your macbook pro had to restart (?) because there was a problem yadda yadda" then it just went to my login page. I typed my password in, then AGAIN it restarted. I'm good now, but has anyone ever experienced this? What happened?