Ever since the app did an update to allow HD and ULTRA HD music, the music will play for maybe 5 seconds before it needs to buffer, on wifi or mobile data. And then it buffers for minutes without playing or loading. I went in and changed the settings to be the "standard" non HD format and still sits and buffers. Defeats the purpose of having it. Much less the 15 bucks a month for a service that doesn't work.