Seen this issue multiple times now, and it seems like it is on the Sonos Side of the house. I use an 2nd Gen Alexa to control my 5 speaker (via the auxiliary input). Occasionnally (several times / week) the music audio simply stops. The Alexa is still responding but you cannot hear her responses and you cannot hear the music that is playing. There is an easy fix that I’ve found, in unplugging the auxiliary input from the Sonos, wait a few seconds, and plug it back in. When I unplug from the Alexa side, the music starts to play via the Alexa (so it was playing all along). When you unplug from the Sonos and plug back in, it typically starts to play again. Once I had to power cycle the Sonos to get the music started again.
I’ve seen this issue streaming both from Amazon Music and also Sirius XM Streaming (not sure that it matters, but as a point of reference). The 5 is an excellent speaker and I love the volume of music and tone, absolutely love the purchase and experience.
Thank You in advance,
Marc