This bug is driving me crazy. At our home, my wife and I have each a number of apple devices (MacBook, iPads, iPhones) and we also share a Sonos Play 5 + Sub.
I got an Apple Watch for christmas and just recently noticed a bug when someone is using Sonos with AirPlay where the watch goes crazy. It be comes unusable. I contacted Apple and they said the issue is with Sonos.
Any idea how to fix this? Sonos is up to date. Tried restarting Apple Watch and nothing.