Upload of Flight Plan fails

The telemetry link between WingtraPilot and WingtraOne can be unstable on the ground during upload of your Flight Plan. In this situation, you get one of the following warnings and the preflight check is not turning green. Click again on the preflight check to retry uploading.
"Communication timed out. Please retry uploading your Flight Plan."
"WingtraOne did not respond. Please retry uploading your Flight Plan."