my macbook pro retina goes black shortly after waking from sleep
For the last couple of weeks, my MBP retina (15") blacks out at random intervals. I guess I most commonly see this shortly after the laptop wakes from sleep. The display comes up, and then a little later it goes black. The blackout seems to last ~20-30 seconds and then goes back to normal.
Is this likely due to a simple setting I can change, or should I be heading to the apple store for genius help?
MacBook Pro (Retina, Mid 2012), OS X Mountain Lion (10.8.2)