The problem should be solved once you turn off buggy Thunderbolt LAN Ethernet driver. Here are the steps: 1) reboot with CMD+R pressed. 2) open Terminal 3) sudo 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 Solution has been taken from one of the forums. That's personally helped me with my mid14 macbook pro Retina 15 UPD: How did I find this I have the same issue with random "silent" shutdowns. Mac randomly turned off with the screen on, fans started to work at max level. Few repair services tried to diagnose the problem but unsuccessfully. All the times diagnostics showed "all is ok, maybe battery". I have replaced the battery but issue was still there. In the 4th repair service engineer found out the issue with voltage: with some random load on computer voltage on motherboard was going down from 12V to 11,5,...