spektrum dx3
 

hi all i have the spekrum dx3, i have done the bind to the receiver all is good.
but a week later i turn on the trans then the receiver, both the rec and the trans are light up with the green constant glow, now batteries in both, steering works but no throttle.
if i re calibrate by pressing the mode button on the speedy and re set the throttle nut and brake all is good, how can i stop having to re set with speedy?

and is this normal

help please