I have exactly the same problem changed almost all sound setyings and advanced settings but nithing. Was also forced to connect via Bluetooth fir sound
Other 5.1 sources work its only the EAC3 variant that is not working. And I tried connecting it through HDMI and straight with S/PDIF to my soundbar and nothing. not getting any sound
How do I get EAC3 5.1 sound to work om this box as I’m getting no sound playing these video files through plex but on my native plex app on LG tv it works fine so problem is with the box and not my plex