Have you updated your Sonos app, and the firmware running on your speakers? Have you removed your YouTube account, and then gone back and re-added it? Have you called Sonos Support directly to discuss it?

When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

thanks for the advice ​@Airgetlam will do that and let you know