@Persson101 

No, I haven’t the same problem. My Era100 and also Era300 work without issues using the original Sonos audio to usb c adapter. 
 

If you are looking for help, please give us some more information. Do you also use the original Sonos adapter? Maybe it’s damaged… I would call Sonos support after sending a diagnosis. If they can see anything there on adapters hardware, they probably will send you a replacement. 
But the other question is… how du you use rwo sources, phono and tv, with the same adapter?

Hi Ralf

i’va had the same issue earlier, and i talkes to Sonos support and they then said there were software/app issues.

and after a update, it was all good for some time. Until IOS update to 17.6.

i use an RCA-switch, so i can switch between sources inn/out. Quite good

And yes, i use the original adapter

@Persson101 

Ok, thx for clarifying… so imo there really might be some wifi issues. Did you try to set audio compression to „compressed“ instead of „automatic“?

Also you can try to set a higher aufio delay in room settings of the stereo pair. 
Moving the Eras to another place just for testing can also help to locate the reason for the problem. 

I’m not stupid. I’ve tried al suggested sullutions,  but it’s an SW issue.

It’s all Sonos SW and they should own up to it.

But they don’t. I don’t rely on them from now on

Uups… sorry, I‘m not stupid, too. Just tried to help with some advice. But maybe it was my fault that I didn’t get it right you already figured out „it’s all Sonos SW“.