Hi all - I'm hoping someone here can offer some insight to a super annoying issue I've been dealing with for a while. I have a 15" Retina MacBook Pro that I bought refurbished from the Apple Store in October 2014, but it is an October 2013 model. Starting around last November I believe, I began noticing an issue whenever my laptop goes to sleep. If I close the lid too quickly, it'll be totally unresponsive with a black screen when I open it up again. Sometimes the fans will be running and the machine will be hot. Usually the only thing I can do is hold the power button until it restarts, at which time I'm greeted with a black screen displaying the message "Your computer was restarted because of a problem, press any key to restart." I do that, and then everything re-opens just fine. The only way I've found I can avoid this is to close the laptop lid veeerrrry slowly, like comically slowly, or to just click "Sleep" in the Apple menu and then waiting a second before closing the lid. I've gotten into the habit of just doing one of those two things, but I really don't have any other issues at all and everything works fine otherwise. However, this issue is super annoying and I'm really getting sick of dealing with it! Does anyone have any ideas as to what the problem might be? I'm totally stumped...