-music keeps playing after headphones or bluetooth are disconnected
-lock screen controls are gone while notifications are enabled
-have problems with external controls not functioning or launching while spotify is running(smartwatches and the like. mine would show album art but the controls and library features did nothing)
disable or uninstall battery-saver applications. Battery managers can interfere with programs like spotify running in the background. I would recommend uninstalling any battery managing programs or adding an exception so that they allow spotify to do its thing.
ALSO android nougat dose feature causes the same problems, but it is easy to add exception for spotify.