How often should I calibrate the compass? Also when I have the drone in smart mode and set the look at me mode it will not. It did it the very first time I flew the drone after I got it but now it will not, any ideas?
Yes... spinning the airframe around to perform the compass calibration puts additional strain on the gimbal motors that are trying to steady the camera... particularly when they are in an inverted position, even momentarily. You can hear them buzzing with the vibration... not a good sound.