OS X 10.9.2 fixed it for a while on my 13" MBA (2013) but now its coming back. Its the same problem where the MBA is going to sleep and I wake it resulting the Mac to just shut down. I also got one where it was a black screen but the mouse was still usuable. Never happened before. Should I take it to Apple? I bought mines in June so I still under the 1 year warranty. Or is it still an OS X bug?