Here is a GIF of the problem. It is running this code.
The app starts and then goes into the background. When I open the control center it has a valid screenshot of the app, when I touch the app again it disappears to the background again. :S
This App was installed before I updated to IOS 11.1.1. It seems to be related to updates. I will verify it as soon as I have installed IOS 11.1.2. The problem is that I have to update Xcode as well else I cant compile for my Ipad 
(and i’m lazy today so i’m not doing it)