I have been experiencing this persistent problem on the Channels app on my Fire HD8. Almost every day, the first time I open the app, I am taken to the "Welcome to Channels" page and prompted to complete setup.
It resolves and connects every time when I manually enter the IP for my server. So, it's not a show-stopper, but it's annoying and time-consuming to have to do this on a daily basis.
This problem only exists on my Fire HD8 (10th Gen) tablet. I recently changed over to the Beta version to resolve other issues, but this particular problem has persisted even after the version change. I also have the Channels app on two FireTV sticks and an iPhone, but have not experienced this issue on any of those devices.