Well... My impression of my 2.7GHz 16GB / 768GB MBP Retina is changing a bit... Did it once the other day, twice last night and now constantly this morning. It just shuts off on me for no reason. Even if I'm not touching it, the thing can't go for more than about 5 minutes today without just shutting off instantly. I just made an appointment for this evening at the "Genius" Bar so some guy can look at it and go "uuuuuuhhh..." before taking it in for repair. Then it will sit there for 3 days before they realize they can't fix it and will have to replace it. I'll have to call them 3X daily to get them to admit that and then they'll order me a replacement, which will take the current 2 to 3 week wait to arrive. Yay!