For the most part I am using my Surface Pro connected to a Surface Dock that is then connected to an external screen and keyboard. I prefer using the 'second screen only' setting in Windows and leave my Surface with the Type Cover closed. My Surface is usually in Sleep mode and I then press a key on the external keyboard to wake it up in order to use it with the external keyboard and screen. My problem is that I cannot consistently use the Surface as described above. When I choose 'second screen only' the Surface reverts back to 'PC screen only' after some second (less than a minute). If I then open the Type Cover and change the setting back to 'second screen only' and close the cover again, then it again reverts back after some seconds. The only thing that seems be a consistent viable workaround is leaving the Type Cover open as it somehow prevents the Surface from reverting back to 'PC screen only'. The above-mentioned problem does not seem to be consistent - meaning that sometimes it's not a problem. Therefore, there might be other factors influencing it, but I haven't identified them (yet). Disconnecting and connecting to the dock might influence the stability, but it doesn't seem to be consistent. It does not seem to be influenced by whether the external screen is connected to the dock or directly to the Surface. List of hardware and relevant settings: Surface Pro Intel Core i5, 256GB SSD, 8GB RAM with Surface Pro Signature Type Cover and Surface Dock (all purchased in July 2017). Running Windows 10 Pro. In Windows 10 under 'Power Options' the setting is 'Do nothing' under 'Lid close action'. External screen: Samsung SE650 Series S24E650C - 24" - 1920 x 1080. Cable connecting Surface Dock and external monitor: Lenovo 0B47091 Mini-Display Port to Display Port Cable. https://www3.lenovo.com/au/en/accessories-and-monitors/cables-and-adapters/cables/ADAPTR-DisplayPort-to-DisplayPort-Cable/p/0B47091 External keyboard connected to dock: Lenovo ThinkPad Compact USB Keyboard with TrackPoint. https://www3.lenovo.com/dk/da/accessories-and-monitors/keyboards-and-mice/keyboards/KEYBOARD-Danish/p/0B47198 Any help to solve this problem would be greatly appreciated. Only being able to use the dock and external screen/keyboard setup with the Type Cover open is quite annoying. Thanks, K.T.