I just built a quad and everything seems to be in order. I took it out for the maiden flight and it ended badly! The quad would hover completely fine. I could pitch forward, backwards, roll slightly left and right, yaw left and right, and fly in circles no problem. I then tried a full roll to the left. The quad rolled fine but when I let up the sticks it went into a continuous death roll and did not stop rolling to the left. I was in Horizon mode for this flight. I previously calibrated the gyro and am not sure what could be causing this. Please help!! My quad does not have a blackbox log so i am really not sure how to figure out what went wrong.