回答“Randomly shuts down when not connected to an external display.”It's easier than it looks.... https://outluch.wixsite.com/rmbp-crash How to fix? 1) reboot with CMD+R pressed. 2) open Terminal 3) csrutil disable 4) reboot in normal mode 5) sudo mv /System/Library/Extensions/AppleThunderboltNHI.kext /System/Library/Extensions/AppleThunderboltNHI.kext.BAK 6) reboot with CMD+R pressed 7) csrutil enable 8) reboot and forget about problem We turn off buggy driver, that is for ethernet via thunderbolt. It is possible, you dont need that functionality, like me. Thanks to: https://forums.macrumors.com/threads/hel...-updated-to-macos-10-12-4-mbp-randomly-shuts-off.2039446/page-4 and personally to Lukas Kroll, who wrote here in comments about that solution found in that forum.