First, discount the “view” in the Sonos software that it’s playing. Those bars have pretty much nothing to do with a signal coming through, in my experience.
There’s quite a few potential issues that could cause this behavior. I’m assuming that this CONNECT is attached to some sort of amplifier, which feeds the speakers?
There could be an issue with the connection between the CONNECT and the amplifier, between the amplifier and the speakers, or between the CONNECT and your internet, or even an issue at the server end, where Spotify isn’t serving the stream properly. There’s not enough information in your post to determine where this issue lies.
Where I’d start is the possible connection between your CONNECT and the internet. I’d be looking for sources of any potential wifi interference , to ensure that the stream isn’t being interrupted.
I’d probably want to double check that the CONNECT itself wasn’t overheating in some way, by looking to ensure it had appropriate ventilation, and ensure that it wasn’t stuffed somewhere not to be seen, where there is no airflow.
And, actually, I’d be very tempted to 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 phone folks, they have tools at their disposal that will allow them to give you advice specific to your Sonos system and network.
