I had my first emergency crash landing with my Air 2S today. I was taking pictures of a log cabin in a forest with trees all over, so I had to disable the obstacle avoidance to get closer to the trees. As I was inching forward between a branch and the roof, the drone just took off forward and I heard it hit the roof. I managed to get it back in the air somehow and it seemed to be alright, although pulling a bit to the side. I started to bring it home, but the second it got close to the roof it just took off again and did the same thing. I heard it hit the roof and at that point I've decided to force land it behind the cabin on a sloped forest floor. It wasn't the softest landing, and some weed's got chopped off and stuck behind the gimbal but given the drone's erratic behavior I was glad it's down. My question is: what could've cause it to suddenly take off like that? I was about 1 foot off the roof when it happened in both cases. I've heard about people losing drones when flying close to the water, but this didn't make sense. Any advice is appreciated.