As you are using Sky Q - perhaps see this thread for some helpful info. from Staff:

https://en.community.sonos.com/troubleshooting-228999/troubleshooting-sonos-on-wifi-6856334?postid=16520976#post16520976

Make sure Bravia Sync is enabled on the TV. Run TV Setup in the Sonos app and follow the instructions. When the app instructs you to, connect the Arc to the TV’s HDMI eARC port using the Sonos-supplied HDMI cable. When the Arc has been successfully connected, connect the Sky Q to one of the TV’s other HDMI ports.

Use these settings on your TV:

Speakers - Audio System
Auto System Prioritization - On
A/V Sync - On
eARC - Auto
Digital Audio Out - Auto 1
Dolby Digital Plus Output - Dolby Digital Plus
Pass Through Mode - Auto

Thank you so much for your reply, I had irr to all set up exactly the same except for the pass through mode, I had it on “on” and not auto , but no clue what it does !!

thanks again