Since the iOS 11 betas, my 6S has been getting the "No Signal" message after using a GPS app like Maps, Google Maps and Pokemon Go for 10-15 minutes. It gets a little hot also. The signal comes back after closing the app for a few minutes. I have tried restoring the phone as new, but it didn't change anything. Am I the only one with this problem? It gets annoying when you get lost because your phone stopped tracking your location in the middle of a trip.