I have been flying my aerobird for about 2 months and last time out I had an issue with it banking hard to the right. I have never had this problem before and it was fine the first flight. I landed it (soft) and threw in a new battery. After take off, it just banked hard right and crashed. I checked the wings and tail for problems and everything looked/looks to be in order. I launched again, by hand this time, and it did the same thing. However, when I turned the motor off it seemed to go straighter before it crashed. Any suggestions/ideas of what is the problem and how I can fix it would be greatly appreciated. Thanks!!