Sometimes I'll press on a song and it just won't play. It will turn green and the play button will switch to pause as though it's playing, but no sound. Later on it might magically play. Problem seems to be limited to music I have not saved to playlists. For example, I'll be listening to a new song and 'go to album' and try playing a different song but get nothing. Have tried uninstall/reinstall but problem persists. Never happened on Android!