Thanks for the input. I can assure you that the battery does not move during the flight so as you said it should not be CG problem. I am the only one in the club, who is running the JR XG14 transmitter, rest of the guy are either Spectrum or Futaba and none of them have the same problem as me. I thought it was my old XG7 transmitter which was the problem, but it still continue despite me updating the transmitter to XG14 which is brand new. So what are my options...change the whole system to Futaba? It will be expensive and there is no guarantee it will solve my problem...what do you think, best Jan