I have a Futaba 3PM 2.4 that has worked great up to now. It has been bound to 5 receivers but now it will only bind to 2 of the 5 recievers. the transmit light is on solid green when I try to bind it but it will not bind. I can bind the 2 recievers that it accepts to another radio with no problem and bind back to the 3PM but the other 3 will not bind except to another radio and not able to rebind to the 3PM All the recievers are R603FF and R603FS and it binds to one of each of them. Thanks for any help you can give.