I've had my GS6 for months now and haven't really had to use directions since purchasing the phone. I tried using it yesterday and the app wouldn't stay on in the background (I switched to Spotify / Glympse). I know that on previous android phones I could switch to a different app and get voice announcements on where to turn. I had to restart the app at least 4 different times and start the navigation all over again. Any ideas? Am I missing something?