So I have an interesting issue with my Retina that I have had for about a month in a half now. It all started happening after the recent EFI firmware update that came out of the 19th. And the issue happens about 50 percent of the time. When I put my MBP to sleep all is fine. But when I open it to try to wake it up, it tends to just go to a black screen. I know its on. I can slightly hear the fans. Even when I hit caps lock the light goes green(but the backlit keyboard is off). Only way to get out of it, is a hard shutdown. I have to tried to fix it. First I thought it might be a power nap issue. So I disabled that. No go. I even went as far as doing a full Erase & Install of the OS. And I did not bring over a time machine backup. I set it up as new. Did not solve. Im not sure what to do. Right now I turned off automatic graphics switching to see if that has anything to do it with it. Any help or comments are appreciated.