I have been using a DX3R for a number of years with no problems. I just put together an Associated SC10 4x4, HyTec digital servo, 3100 reciever, Tekin RX8 ESC and Tekin 550 5.5. Problems started when I bound the reciever to the radio. It bound once, I noticed the servo was not centered ( I thought I had gotten it right. I have 7 other cars and they all work just fine) I shut off the radio and reciever, adjusted the servo and turned everythig back on. I lost the bind. When I tried to rebind the radio it would not bind to the SC10. I checked my wiring, battery, changed the batteries in the radio and truck. It still wont bind. I then tried to bind the recieve out of the truck with a stand alone battery I use in my pan cars (7.4 LiFe 2s) the reciver still wont bind. I tried a different reciever ( I have 8-10 3100-3520's in different cars and spares) Still the radio wont bind to ANY reciever. I tried other model settings in the radio, I reset the parameters. It wont bind. I called spektrum and they are at a loss. So I send the radio back as they felt it was the radio. I bought a second new DX3R Pro, came home set it up to the truck again, It bound once, but with no motor of steering function. I shut it off, cycled the power on everything and it lost the bind. Same story as the first radio! They are now both on the way to Spektrum with 3 of the recievers I tried. I also sent the RX8 ESC to Tiken. The only variable in the truck is the RX8. I use RS or RS Pros in everything else and NEVR had a problem. Has anyone seen or heard of anything like this? I just need a clue as to why so I can avoid it again. This has gotten expensive