Sonos Arc Ultra not wotking with Sky Q and Sony AF8 OLED

It’s actually likely that you’re missing the common link, the TV set. Your Sonos is getting the signal from the TV, the Sky device (which I’m not familiar with, since they’re UK only). The TV then should be passing on the signal to the Sonos. What it sounds like (no pun intended), it your TV isn’t handling the changes properly, and you have to ‘reset’ something for the signal to be properly passed through.

I would suggest a few things. First, check your TV for any updates from the manufacturer on the firmware it runs. Update it as necessary. It probably wouldn’t hurt to check both the Sonos and the Sky system for updates, although I’d hope both CS groups suggested that. I’d also reboot the TV completely, by unplugging from the wall for at least two minutes. Finally, if that doesn’t change anything, I’d go back to Sonos with a diagnostic. But I think thousands, if not millions, are using Sonos and Sky without much difficulty, which makes me think it is a local, and solvable issue. 

Thanks for the response Airgetlam. I have checked for firmware updates, rebooted and shared diagnostics with Sonos all to no avail.

 My last resort is to use a CEC blocker on the Sky Q hdmi output as I have read that may work..

Since posting I have seen other posts from people with a similar, if not identical, issue so I know it is not just me.  I still feel that whatever the cause I should have the option to return the Sonos as it is not fit for purpose in my use case.

It’s indeed unfortunate, I suppose, that the TV manufacturer or Sky has a bad implementation of CEC, when Sonos works with so many other devices worldwide, but if you can’t get them to change, I understand your position. 

Maybe worth swapping HDMI cables around too, in case the cable is failing.