Autopilot A320 neox loses course

I have to search for these tutorials better. I have installed the FBW A320 at the beginning of December (so litte experience) ,have read many times the FBW instructions but couldn’t find a real solution to remove these discontinuities. I have loaded the latest STABLE V 0.9.1 and Simbrief 0.3.19 and have no subscriptions to Navigraph. I suspect that some problems are nested there.