Apple TV+ (on Apple TV 4k 2021): no more sound on episode change
already posted months ago (here)
called Apple Support and been guided through many troubleshooting steps (including a full factory reset)... to no avail
was told, in the end, to wait for a firmware update (don't remember which version was back then) and... that did indeed *mitigate* the issue (but it never went completely away)
now on tvOS 15.2 it is fully back: watching anything on Apple TV+ is a nightmare (when the above happens I must exit Apple TV+ app then "restart" it. often I must do this two or three times)
everything's fine in any other app/platform: Netflix, Prime Video, RaiPlay, Plex, YouTube... you name it!
TV is a Sony KE-48A9