What station?  I’ll try it here if it’s available.

Are you using the Sonos Group function to have them all playing the same stream? Not Grouping, just playing individually almost always gets out of sync.

You can submit a diagnostic when it happens and call Sonos to have them look at internal data we users can't see.

Thanks for the replies. The station is 103.3 Moose FM, from Parry Sound Ontario, Canada. I do do have a lot of my speakers grouped, but I've confirmed that the noise is present in individual speakers, single, paired, or grouped. It happened again yesterday.

Good idea about the diagnostics!

Tried submitting the diagnostics - we’ll see . . .

I hope you called in, they don’t look at submitted diagnostics unless prompted.