I threw out the battery question because with a 6 volt pack, and the constant servo movement caused by the gyro on the rudder, you may be harming the servo. I suspect that if you go to a 4.8 volt pack, you will see no more problems.

You have to keep in mind that putting a servo on a gyro causes that servo to see a lot more small movements. Constant back and forth will greatly increase the current draw of the servo. Another question, are you reducing the sensitivity of the gyro when the gear is up? If you're leaving it at high sensitivity throughout the flight, the servo will be under that higher load the entire flight. With my BobCat I use 100% gyro gain with the gear down, but only 20% gear up. I am also using Duralite batteries which supply about 5.8 volts. As I said earlier, 265 flights on a 450 gyro with no problems.

Gordon, please return the bad servos to Horizon with a detailed note on the problem. I will also contact them and let them know of the issue. BTW, a 6v regulator is still a bit high. I would go to a 5.2v system.