Hi, I fly with a JR 8310 and use a JR 226 FM receiver with 4 of my planes. Just recently I lost a brand new fun tiger because the receiver / radio just quit on me for no reason. However, I don't know if it was because of a glitch or interference. Anyway, I just completed a Katana V2 46 and used the same receiver. First flight was almost the last. The elevator just pulled the bird up vertically at full throttle after take off, but I got it under control and landed right away. I then conducted a range check with the engine running. I walked about 40 paces with the transmitter at arm's length, antenna folded. Not once did I lose control. Can someone help me with this problem? On ground and with the engine running at different speeds, the range was good. However, once in the air, the plane becomes unstable and cannot be trimmed. Any help would be greatly appreciated.