Audio stops when changing HDMI source on tv

    I would like to let the music play to the dac on a rpi3b+ when switching the hdmi source on this older sony bavaria tv, but it always stops playing doing so. only when i turn off the tv this works... also when using airplay... any ideas how that can be achieved?

    Edited once, last by sreusr (July 20, 2019 at 12:49 PM).