When I use spotify (and also when I pause spotify), the automatic screen saver (after 30 sec.) doesn't work. Even, if I screen saver is turned on and I move my phone, the lights switch on and do not turn off again. Thats why my energy is always low und my iPhone is warming up. Deleting a the app solves the problem. But after reinstalling spotify, the problem stays the same. How can I solve the problem?