Good luck. Autel have gone silent on me.
What settings did you use for your flight?
10 bit, log, h265?
30 or 60fps?
What was the speed and size of the SD card.
Have you checked the data stats from the recorded footage with something like the
Mediainfo app?
Are you using an ND filter for your flights, and shooting wide open, f2.8?
The horizontal flashing in your shot could be the props interfering with the footage. There is a term for that - 'Prop shadow' or something like that - but I only read it once before, and the name for it escapes me. Not sure if that applies here or not. But whatever it's called it tends to happen more in misty or dewy conditions. It's where the sun hits the props and reflects into, or, onto the lens.
The focus hunting could be partially the clouds playing havoc with the autofocus system if being shot wide open. As someone else mentioned focus lock would, or should, help there. If you have a strong ND filter on this would also affect the autofocusing, especially if it is a non-standard one. If not, then there is a problem with your bird.
You also seem to fly quite fast, are you in ludicrous mode?
Flying fast will also have an issue with focus blurring and hunting, I would assume as the system needs to lock on to something, and if you are flying around pretty fast and turn very quickly, the AF system is working harder to lock onto what it thinks you want it to focus on. Are you shooting in one of the intelligent modes or standard?
In the 'Topolnica dam no water' video, nearer the end, you have a similar issue in the Vitosha video where a pinpoint light is reflecting into your lens. It looks like a white spot or light. Weirdly this is when the sun is behind you, or, at least, to the side/behind you. This happened to me ages ago with some light leaking from a poorly fitting and badly made filter. It has also happened when the coating on the lens was thin or a UV filter was reflecting onto the lens when the f stop was smaller, say f5 and above and also shooting into or tot he side of the sun without a lens hood with a wide angle lens.
Not sure if you were using a filter or not but a little more info about your technique and settings would surely help diagnose the issues you are having.
