This NUC5i5RYH is really a weird thing: Flickering screen, HDMI output is only working if using woodo cables, suddenly blank screen after wake up, and now this alpha product has a new surprise when waking up the screen: The screen is there and the background picture and all the task icons, but no way is it possible to switch to any of the applications.
So the only solution, as is now daily routine with this alpha product and its many blackouts, is to cut power and restart in the hope that it then works.
This product should now have been sold before it was ready for it, but sadly Intel seemingly sells alpha hardware without telling this.