I have 4 newer Sonos One SL speakers. Two are in a pair. After initial installation all was good but now after a couple weeks I can no longer connect to the paired speakers using Airplay to stream my Amazon Music. I can see all the speakers in the Airplay list, the paired speakers and the two individual speakers. I can still connect to the two single speakers with Airplay. I can also connect to all speakers using the Sonos app, and I can stream my Amazon music through the Sonos app. I have factory reset the paired speakers, but still no dice.
There are no issues with Wi-Fi networks, coverage, etc.
I see a lot of similar problems listed here, but not this exact scenario.
Any ideas?