Here a screenshot of the DH screen whit the drone stopped. https://photos.app.goo.gl/jyqGjqD8gt2CkYPA2 Watch the hourglass in the bottom-right corner. DH had become unresponsive. Even restarting it gave the same state back. I had to reboot the tablet, then it became responsive again.
Thanks for reporting this and thanks for the screenshot. The flight execution is carried out by DJI's on board software. After the upload of waypoints, DH is only monitoring the progress and interfering if we spot a deviation from normal execution. It is pretty difficult for us to understand what exactly could have gone wrong. The hourglass display depends on the drone state and it could be that due to some communication error (like you suggested), there was a timeout reached in the app, from which it could not recover. In general, we do not get many reports of such nature of the Mavic Air, so it could be hardware error. We will investigate further and would really appreciate if you manage to find more information about about how the error occurs exactly. Thanks! David