This has been happening for some time now - but I’ve just put up with it.
Randomly - my Arc disconnects from my tv - it shows the tv volume controls on screen for a second (as I’m guessing the arc is disconnected), the sound comes through the tv speaker, then the arc connects again and takes back over the sound.
It does this for a minute or so, then works again. This happens maybe once a week? Sometimes not for a few weeks.
Ive tried resetting the arc, tried changing the hdmi cable. The system is up to date.