I updated dji go4 app to 4.2.20 on my android phone and on my first flight I had my spark 120mts high and 180mts away from the controller when it decided to disconnect from the controller. Nothing I tried would allow the drone to reconnect. Thankfully the RTH function allowed it to come back. I then flew the spark again using two batteries with a different android phone using the old go4 app and had no issues when the drone was 120mts high and 800mts away from the controller. Obviously there is a problem with the update. Interested if anyone else has experienced the same problem