We pay for the premium versions of Spotify, Apple Music, Pandora, and Amazon Music and this problem occurs across all services. Our guests are not on our WiFi network, but could even just having phones on cause havoc?
Best answer by pwt
You may want to describe the installation in more detail -- what devices you have, their proximity to one another, which are wired, etc. Depending on the answer, it could be that introducing a wired BOOST, or wiring additional devices, might help.