Hi @BessCarr, welcome to the Sonos Community!
Are you grouping both speakers together when playing? When the Era 300 or Move 2 stops playing, does the app show them as still playing music or are they paused? If they’re still appearing in the app but not playing anything, it’s likely caused by interferences or network issues, as those can cause audio dropouts, skipping, or no audio at all.
If the app shows the dropped speaker is still playing, then I’d recommend checking our article on reducing wireless interference for some tips and suggestions. If it’s not playing, are you able to start playback again in the app? If this happens when the Era 300 and Move 2 are in different rooms, try taking the Move 2 to the same room as the Era 300 to test if it starts again. If you could also provide your networking equipment (router, any extenders, access points, etc), then the community and I can help troubleshoot further.
If it happens again, it’s worth submitting a diagnostics within ten minutes of the issue occurring, then contacting our support team for further troubleshooting.
I hope this helps!
