I think the only problem futaba had was that they reused a few digital transmitter codes on earlyier units and recivers could be confused if you had 2 radios with the same code but that has been long repaired.

we had a newbie that had all kinds of problems with his dx unit but most of them were self induced and some we had no idea could happen. He used thread lock on servos which seems like a plausible idea that the veterans never thought of doing because going into the plastic is like using a thread locker. the thread locker made the splined post on the servo break. We scratched our head on that one. He also melted the reciver, we never got a truly good answer on that one everything was set up correctly, someone read something in the manual about not wrapping the reciever in foam so that heat could disapaite but it never concerned me to follow it up and it hasn't happened to him again. I felt sorry for him having so many problems out of the gate but he stuck with it and didn't get discouraged, a lesser man seeing these problems probably would have.