Hi,
We believe that the issue is related to DJI SDK and can happen in some cases. Make sure that you have the latest version of the app which supports the latest SDK. There is a community post where this topic is already mentioned: 207475343
At the moment we advise to make sure that you have internet connection when you try to connect to the drone if you receive the warning. After that you should not receive the warning again and it should not be necessary to have the internet connection everytime you want to connect to the drone. If this does not work, close the app and unplug/plug the micro-usb cable on the controller and device and try again.