Hi, I have a MacBook pro (retina, 15" inch, late 2013) I have just updated to Sierra and after I did this my computer shuts down randomly.. Sometimes after 1 min, sometimes after 10 mins.. It only happens when i do NOT have an external display connected via HDMI or Thunderbolt. If I have that, then everything works fine. It has nothing to do with how much CPU I am using.. I have also tried to reset the SMC.. When I do start the computer again, it doesn't come with an error log. I have tried to run the Apple Diagnostics Test as well. The result was no problems with the hardware. Does anybody know a solution to this problem?