I've been having this problem with my rMBP 13" late 2013 since a month after i got one when they came out october 2013. thinking maybe i jumped too soon on the product (normally i wait at least one turn/half generation so apple works out kinks...). one month after i first purchased my original computer this issue started wth me, and i met with a genius that ran the diagnostics and immediately swapped it out, as it was totally a hardware issue with circuitry at the power adapter slot beore even the logiv board.
the second time was about one year after purchase, and same thing, and they swapped it out.
third time they said that was not the issue, they said the titanium looked a little dirty, and fixed the video graphics card, which was not the problem.
they refused to look in my apple care history and sent it off for repair, but i still get the sleeping thing, even if the cmputer is left plugged in, so no "energy saving" is necessary.
i reset the display, pram etc, ran the AHT, says battery issues which i will address, but any word on whether apple is addressing this sleep/flashing screen/ non waking up issue for the 13"? i know for awhile they were recalling only 15 and 17"'s which seemed a little strange to me, especially given the amount of customers wth the same problems!