Are you running a 4.8 or 6volt bat pak? I'm waiting to hear confirmation on this but, my theory.
your running a 6volt pak with a regulator your regulator is telling you it's about to pak it in causing your servo to twitch the longer the servo is receiving power friom the Gyro the worse it gets because now the Gyro starts to act up.
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Remember this is a guess!!!!!!! Be interesting to know if you are running a 6volt pak