RE: Programming Futaba 6EX for an Axe 400
Difficult to tell if the gyro caused the loss of rudder but it is possible. Some fellow have reported gyros failing.
Could also be a bad servo pot that causes the servo to change position. Turn off HH and move the servo very, very slowly from end to end with transmitter control. If the servo jerks at any time, it may be defective.
Also try hovering with HH off to see if it occurs again. If the above check and it does not do it with HH off, it can then be the gyro.
Try those steps so you can relate the results to the Hobbico Techs.