Hello, I am on roughly my tenth flight with my Phantom. I am well versed in heli flying as I have owned just about every type over the years.. Bought this for video. Anyway, first five flights I was very impressed, super stable while hovering and flying. The last five it jerks around pretty badly.. like there is a delay with the GPS and it catches late. Quite jerky while hovering but also jerky while flying around. Never crashed. Just recalibrated the compass and it didn't help wither.. Any ideas?