If you have a H920+ the camera gimbal calibration is simple. It might solve your issue.
1- place the H920+ on a level surface and turn on the ST16 and then the 920. Let the units completely initialize, camera view on the ST16 etc. This may be done inside.
2- select settings/calibration on the lower right of the ST16 screen. Then select camera gimbal calibration. The camera will then perform quite a dance for about 2 minutes. Do not touch anything during this period. When the ST16 and camera return to normal state, the calibration is complete.
Also It is very important to leave all controls alone during initial power up and initalization. Any control movement during this period can cause problems.
Thanks for all the help you've given me.your vast knowledge has helped me with every issue I've had with my typhoon plus and my tornado. I have watched videos so much to try to avoid all the pitfalls some are helpful others entertaining.the knowledge you guys share is immensely helpful.