Wiim Amp HDMI ARC stopped working

Hi guys,

I recently got a WiiM Amp which I use for spotify streaming an also to connect my TV to my speakers via HDMI ARC.

For the first few weeks everything worked fine, but last week just ARC stopped working in the middle of watching a series.

Spotify streaming still works fine and it seems that the connection to the TV still works (the amp's status LED turns orange and in the app the source switches to HDMI ARC when the TV is on), but there is no sound.

I did already try resetting both TV and amp and also tried a different cable, but to no avail.

Is anybody here experiencing similar issues / do you have any ideas what else to try?

Thanks! :)