Lately I listen too many problems about Air 2S. And if you think that Air 2S is maybe the best selling drone of DJI then user will be disappointed about this company.I had a weird thing happen recently to my Air 2S and blamed newbie skills. My video recording stopped and then restarted a new file in the middle of a flight. After another couple of minutes it just dropped to the ground - almost into a creek (yikes!) but I flew up and it returned OK.
I noticed after a few more flights that one of my batteries wasn't holding a charge. It would self discharge by 30% over a couple of days.
After reading about your experience here, I'm pretty certain my issues were caused by a malfunctioning battery. I returned it to DJI, they tested the battery and told me it was defective and sent out a new one.
Your problem really looked like to be the battery.
But in my problem, the battery was 2 month old new with only eight full charge times and I was looking for past data of the battery and all were good.
Even if it was created problem at the battery while flying, it's Dji's fault because the pre flight inspection didn't show any problem.
I'm lucky at least that the drone had fallen 20 meters away from me and not at 200 away at the wood that it was 2minutes before the flight. Always look of the lucky things hehe.