This topic is 2 years ago !
And the solution proposed is to switch off every time the CEC control on TV or add a switch???
The ARC costs 1000€ !!!
The problem is that if I choose to listen the TV on headphones or TV speakers, the ARC overtakes destination and the sound go only from ARC.
The problem is known by SONOS and for over two years!
When you can solve the problem???