I had the same issues With My Mavic Pro but I fixed it here is what I did
1. Turn off both remote control and the drone.
2. Remove your mobile connected to the remote control and remove the cable connected to your RC to mobile.
3. now attache the cable separately to your mobile(don't attach your mobile to remote just connect the cable from RC to mobile).
4. Now turn on your RC and the drone and the DJI go 4 app wait for few seconds den u I'll get an update in the DJI go 4 app home screen update it and den you are ready to fly