There was no special reason. It was used as the master controller for a year period. I noticed that the controller discharging very fast then simply shut down, drone landed.
I changed it to slave. The controller's battery is very special, you can't simply change it, not even buy another battery...
Here's a video I made! https://youtu.be/siWX7oADOTM
If I can't buy a replacement battery for the controller, I will refurbish the old battery.
There is a balancer board on it, so i will replace the cells.
This solution works! Shou first and turn on "enable hardware decode". Everything Is better than before. There is only a little lag now. Maybe the 16mbps setting for the video is too much?
I'm used shou only 2 times on ipad air 2, the recorded video contains everything but lags and pixelate. My settings are 1080p 16mbps (max), then 1080p 8mbps, same result. I need 1080p, 720p not sharp enough.
Thanks for your reply!