For some reason the Sonos application shows my two Roam speakers are playing, but there is no sound coming from them. I called Sonos support and they nicely talked me through a solution that worked:
- Turn off the speakers.
- When off, push the power button and hold for six seconds. The speakers will make a sound and turn off again.
- Wait 20 seconds or so.
- Power the speakers back up and they worked.
Hope this helps someone.