I have seen it alot. seems like it has something to do with vibrations and the way the sensors interprit it. i've run a artificial horizon on my osd and seen the same thing, line get's locked over for a bit, then suddenly comes back. has something to do with the quality of sensors or the programing of there recovery setting is too high. one thing i do is run low gains, 120-120-120-120 and 80-80 in atti. when i used to run 140's in manual, it would do it more. Started with a complete dji arf kit, then changed over to 28mm motors to handle the wind better and they do