Today we had the engineers from Interproject looking to the screens. Due to a stupid manipulation with my new Wifi router, I lost connected and had to drive home to get my laptop. Once back, testing again, we had an issue with the screen in the living, while they worked before.
Luckily Interproject was still there and could resolve the issue. But we are not sure if the root cause was found and solved. In fact we are sure it was not found.
So we will regularly test to see if al is working well.