Guys thanks a lot for responding. our procedure is as follow JR (master on ) check controls ,plug in, then the dx( slave) is turn on ,plane mode called trainer and trim, intructor goses airborne make altitude trim it before he is ready to released tome he ask to put the same power % of the master JR and then i go.
After 5 min, got desoriented and gave it to him did a course lap and and released to me as soon he told was mine left bank and dive in, yelled not responding , he saved,got me trouble of a glitch in the master button of the JR or the extention of the aileron servo (plug)been losse inside, you know vibration maken a sprak an servo acting funny, just afraid to wreck my bird, thanks
Mariano

PS as soon you plug the bb cord on any of the controls they turn on but we turn the on anyway