decided to try course lock tonight......all was good , or seemed good until i came in for a landing, the bird went into atti mode which has happened a couple of times before and i have just landed it instead of hand catching. this time when it went into atti.......it started doing something i have only read about........the dreaded toilet bowling. glad i did some atti practicing as i take off and land in a confined space.......no crash, but what a handfull it was to avoid house, cars ,shed and trees. any thoughts on why this happened after so many pleasant flights ? did course lock cause the issue ? my confidence in the bird just went from a 9.9 out of ten.......to a 2 !