I flown a few times and haven't had a problem, but mid-flight it said changing mode (pgps). It asked me to recalibrate the compass which I have done several times and it has given me green lights. I go back to the app and it says to calibrate again. I ignored the message after successfully calibrating it and tried to fly the drone. It won't take off and says restart the aircraft and if the problem reoccurs then contact DJI. So my questions is what am I doing wrong? And how do I restart the aircraft? Btw I have calibrated the imu and gimbal to see if that was the problem and it wasn't. Please help!!