Hi @ThiVÂ
Your TV has a setting to turn TV speakers on or off. If this is set to On, it doesn’t matter what you do with the Arc or it’s settings - you’ll get TV sound from the TV speakers and not from the Arc.
I’m not sure why the Arc is still switching over when the AutoPlay function is turned off, but if this was working, you wouldn’t then get the TV speakers playing without the TV being told to use them in it’s settings.
I suspect that with your Playbar, both TV and Playbar were playing at the same time and you couldn’t hear it from the TV speakers as the Playbar was louder. You could use the optical adaptor that came with the Arc to go back to how it was with the Playbar, but you’d lose the option of playing LPCM or Atmos audio. This works because the optical link is one-way-only, and the TV has no way of telling if a device is using the link, so it’s on all the time, regardless of the TV speakers being selected (although this may vary from TV to TV).
The real problem here is that no-one who makes TVs or Soundbars expects people to want to use the inferior TV speakers once they own a soundbar (you did spend €899 on it, after all). As the TV now knows you have a soundbar (unlike with the Playbar via optical), it’s only allowing either the TV speakers or the Arc to play TV audio.