Following the last Windows Update patch, my Surface Book won't detach from the keyboard without a notice to close a few applications, which is quite annoying. For those who are running Spotify premium, you can go into EDIT > Preferences > Show Advanced Settings > > Enable Hardware Acceleration (Set to Off) to ensure that you can safely detach without having to close Spotify. I'm also running into the issue of a conflict between my OneNote Desktop app and OneNote from the Windows Store which is also preventing the screen from detaching. There is no obvious way to uninstall the OneNote non-desktop app, so I usually have to open and close the application before the screen detaches. I hope the next patch resolves these issues.