I didn't have a T-Rex issue but did have one with my Raptor G2. There is a glitch in the heli where it decides to inexplicably fly in reverse cyclic, suddenly, sharply, and without warning. When learning tail in all you can do is pretty much run and scream like a school girl the the heli chasing after you. I've long since replaced, well, just about everything on that heli. AR7k receiver and JR servos now ensure that I don't have to run from my heli anymore.