[blubberblub]

Usually you get this "buzzing noise" if passthrough is enabled in audio settings but your TV/receiver/... can't support it.

Navigate to Settings -> System -> Audio and untick the "Allow passthrough" option there.

so long,

Hias

@Hias you got me on the right track! Right after I saw your post, I took a look at the support homepage of my AV receiver, saw a firmware update, applied it... and my problems are solved! I played a bit with the option you mentioned, but everything is working, regardless if i enable or disable it.

So happy right now! Thanks a lot!