A few weeks ago I found that my gimbal control was not working properly. There was no problem when I angled the camera down, but when I tried to angle to 0 degrees the camera would point downward again. You could get around this by very gently pushing the gimbal control switch to angle upwards. I looked into this in the RC assistant and found that the the X1 switch was mis-calibrated. When you would rotate it one direction, it would reach a value of 1000. When you went the other direction, it would go beyond -1000 and end up somewhere around 800. Because the RC Assistant says you do not need to calibrate the X1 switch I didn't realize you could. I realized the calibration process would take into account the gimbal control. Moving the gimbal pitch control to maximum limits during calibration has solved the issue. Sorry if this seems obvious but I looked through the forums and did not find this issue discussed elsewhere.