My glitch has only been prevalent in the last week and I have had the bird about 3 months, so it didn't happen at all at first for me either. My flybar has been on for about 2 months and my blades are tracking perfectly.

I don't think it is a servo glitch because it doesn't jerk, it simply falls out of the sky. Once it is down the 3-1 goes through the arming process and when it arms the rotors spin about 2 revols.

I tend to lean toward a 3-1 going bad but I'm just not sure.