Airplay from iPhone to AppleTV disconnects when screensaver starts

My Apple TV box is on tvOS 15.4.1 since about a month. Update your Apple TV - Apple Support

Are you using AirPlay for audio (music), for video, or something else (e.g. photos)? Is the streamed content local to the iPhone, or from an online source?

The screen saver should not start when AirPlay is in progress. The idle timer should start after AirPlay has stopped (i.e. the screen saver should then start minutes later).

Try restarting the Apple TV box.

If the issue persists, contact Apple Support.

Source is a browser based internet radio station.

Consider if this station is available through an internet radio app on the Apple TV box itself.

I like the myTuner Radio app, but there are others as well.

tvOS is 15.5

Due to the terms of the Apple beta software agreement, and those of the Apple Support Communities, we can provide no assistance for any Apple beta product. If you are a public beta user, there is no support, but you are asked to give feedback using the designated methods.