SiriusXM (and most streaming companies) use a different server for the ‘Sonos’ stream than they do for their own apps. So there’s no real comparison value between the two. 

But the issues you describe may, or may not be on SiriuxM’s side. There’s certainly a thread ongoing about SiriusXM extra (or whatever it’s called). But you could be troubled by simple wifi interference , a possible duplicate IP address issue, or even a DNS issue keeping your Sonos from maintaining a clean connection with the server that SiriusXM has told Sonos to get data from. 

I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

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

Bruce,

I appreciate the feedback. I don’t think i have any WiFi interference on my network. None of my other devices seem to have any issues. I will definitely try and do the diagnostics. How doI go about doing the diagnostics?

Click on the underlined words in my response. 

What kind of Sonos products are you using?

I have the same issue. Sirius channels will not play on Sonos. I have de authorized, and re authorized the system. I have spoken with Sonos, and gone through the diagnostics. I just get the same reply that they are working g on it and will let me know when it’s fixed (‍♂️).  This same issue happened last year and now is back.