As I have noticed it changes only shutter speed, it goes from 1/50 to 1/80, ISO was alway on ISO 200.
I dont care for that because it is a lot more important that I have EV around zero than that small SS variation, I've been told that everything under 1/100 is good. I record on the ground and then some parts with sky in the frame so I would need to tune it all the time if in manual, increasing ISO when EV goes in - and increasing shutter speed when EV goes in + and I think it is too much work when I need to my subject so putting it on Auto is the best for me, result is the same at the end, smooth video.
I shoot in D-Log Cine and sharpnes and everything on zero. It look better than those -2 -3 -2 on sharpness etc. Also I give it color, I dont see any advantages recording ultra dull and flat colors, I make post in GoPro Studio.