Disconnecting the Symfonisk speakers after some time

Hi, I have an Apple TV 4K and two Symfonisk Frame speakers connected to them. When I set them as speakers, either in menu - settings - audio or by holding the home button and selecting speakers. Everything works, but in about two days I turn on the Apple TV and the speakers are there to choose from, but they are not selected as active. Then I select them again, confirm and everything is ok. And so on and on. Does anyone have any idea what the problem could be? Anyone here using an Apple TV with an Ikea Symfonisk Frame speaker?

Direct selection of a speaker system in Apple TV settings creates an AirPlay or Bluetooth connection to these speakers. This is always a temporary selection from Apple TV’s perspective.

A default selection is only possible for TV speakers or TV-connected speakers (i.e. let the TV handle it), or HomePod speakers.

For TV-connected speakers, set Apple TV to output audio to the TV over HDMI, and set the TV to output any audio to the connected audio system.