Thank you for the information!
We think we know what may be causing this (a crash of sorts in the background) but to help you with your case, we will need to see your output log.
Would you mind finding your game's output log file and sending it to us at support@portaplay.dk
Normally, the output log can be found in this directory:
c:\users\<yourPCname>\AppData\LocalLow\PortaPlay\Broken Lines
In that directory you should see a file called output_log.txt - that's the one that we need from you!
If you cannot find the file, please check this page as it explains how to find it a bit more.
https://docs.unity3d.com/2018.3/Documentation/Manual/LogFiles.html If you do send it, would you mind leaving a note here when that's done?
I'll give the main devs a good old fashioned poke that they should look into it to see if anything can be found.