A. 1. Close the app completely by double-tapping the home button (or swiping up from the bottom on newer iPhones) and swiping the TruckMap app off the screen. 2. Restart your iPhone to clear any temporary glitches. 3. Ensure that your iPhone is running the latest version of iOS and that TruckMap is updated to the latest version available in the App Store. 4. If the problem persists, try uninstalling and reinstalling the app to reset its data and settings.