Interesting. Must be lots of 2.4 and 5.8 interference, and the auto select had trouble finding and using the 40 mhz band. Problem should be isolated to the area you were flying. Generally, Auto will yield the best signal stability and range..
DJI drones don't work the way you are suggesting. The drone doesn't care where it was activated, it cares where it is located at power up and sees where it is based upon gps. Then it applies any restrictions based upon that location. If you...