Anybody experiencing that the GPS on DX shuts off in the middle of navigation, even though the car charger is plugged in the phone. If so, anyone knows how to fix it? I set up my directions on the nav and twice on a 15 minute trip the screen went black on me but I could still hear the nav giving me directions but I couldn't see them, I ended up having to hit the home button then go back to the nav app to get the nav screen again. I have screeble to keep the screen on. Has this happen to anyone else and any suggestions..