Your TomTom app is constantly being updated unless the connection to the TomTom server is lost.
Your app may not be receiving updates from TomTom due to one or more of the following reasons:
Your subscription has expired. Speed limits are no longer shown if your subscription expires, and you receive a message.
Your device may have "Cellular Data" switched off or may be in flight mode. You can check this in your device settings.
You may be traveling through an area with poor wireless network coverage. Check with your operator if you have difficulties connecting to data networks in your area.