There is a video going around in relation to New Jersey drone, about how there drone has mysterious battery issues and won't fly but a few feet off ground.
DJI drones have a feature called geofencing. It uses GPS from phone/drone and then based on that will keep/limit your drone from taking off. It is to prevent people from flying near airports or other restricted area. These restricted areas can be updated.
It has been a feature for about 10 years, so not new. So it is nothing mysterious. The US government has probably encouraged DJI to update the geofencing for the NJ area.
