Airplay and Netflix

I have an audio receiver with internet connection via my wifi home network, e,g. for listening to internet radio, Spotify, etc. When I'm starting the Netflix app on my iPad of iPhone (without starting a film or serie yet) which is also connected the same wifi network, my receiver will be disconnected from the internet. I cannot restore the connection until I've closed the Netflix app and hence this problem seems related to the Netflix app. Unfortunately, Netflix support could not provide me with a solution. The manufacturer of my router (Asus) stated that this is a kind of known error of Airplay. Does someone has the same experience and moreover, is there any solution known?