I used to race 1/8 scale buggies and occasionally my car would go "nuts" and I would have no control. I eventually discovered there was a small fracture in a printed circuit board trace in the receiver. Apparently it had been intermittent for quite some time. I would try lightly tapping on the receiver to see if you can make it "go crazy" again. Maybe just flex the receiver case a bit to see if you can duplicate the erratic behavior. I sent mine back to Hitec and they fixed it for free. (After nearly destroying my car several times). Sorry you lost your airplane.