When connecting my surface book to a 4k monitor it works fine but if I power off, disconnect the book from the screen and then power up, the login camera doesn't work and the taskbar icon says screen is detached. An additional reboot seems to solve the problem (restart not off and then on). Not the end of the world but hopefully someone at Microsoft will pick this up and fix it. We need to get this thing polished asap. i7 version.