Hey everyone! I'm an Inspire flyer, but just bought a new Phantom 4 a couple days ago. I'm in Atlanta this weekend visiting family, and was flying around a park downtown to get some neat shots of the skyline. As I was flying between 2 buildings, the Phantom lost connection with the RC, and the video image on the screen went black. It popped up to activate RTH, but still no image. Around 10-15 seconds into its auto RTH flight, the video image flashed on the screen for about a second or 2, and I see that it's about 5-10 feet from hitting the building! I immediately tried to turn it left to avoid impact, and the screen went black again. Then shortly after, it showed Aircraft Disconnected. I'm assuming it hit the building and crashed. I did have the obstacle avoidance setting ON, so I have no idea how it didn't detect the building and avoid it. The building has another attached level which I believe it landed on, so I wasn't able to retrieve it. Since its Memorial Day weekend and the building isn't open, I'm going to try to figure out a way to get it before I have to drive back to Indiana. So, I'm looking for opinions about why you all think it didn't avoid the building, and whether this is something DJI may possibly cover (even if I'm not able to retrieve the aircraft itself). I have the flight records showing all of this. Thank you for any input!