Today was my first flight with P3 4K. Everything was fine and I was very careful taking off and landing.. I bought the DJI back shell bag. However, at home when I was trying to download my photos/videos to the computer. I powered on the drone without unlocking the gimbal and I think I heard a crack sound. And later on I saw a crack on the UV filter??? WTH... Anyone believe this will be the root cause or I just accidentally hit it somewhere before during packing or unpacking. The len is that vulnerable?? really??