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I am currently having almost a classic problem of a 601. I read so many people having the same problem on the forums. The problem is that everything was fine and suddenly the heli just pirouetted for no apparent reason. Even after I replace the servo, the same thing happened. What is going on? I checked and changed the servo, battery, receiver, the heli , and it still happened. Is there a lifespan for a gyro sensor or amplifier? I have 2 pieces of the 601 and they are less than 2 years old and rarely flown (twice a week or less). I noticed that the rudder control gain (ACGA / NCGA) on my amplifier shows ACGA***% and it the value can not be altered. Doesn't it supposed to display a numeric value instead of ***? If I change it into normal mode, it does shows NCGA130% and I can alter the value. Can someone verify this please? I did send one of the gyro to Futaba to be checked. Hopefully, they can found out what is wrong with it. I am using 14MZ, 37% gain, tape metal tape mounting, Freya, Avant. Thanks.