If it went to failsafe, then it was most-likely a communication loss. Given that I fly my Giants way out there, I doubt it was the DX 8. ( I have two DX8s). Did you ever read the flight data to confirm that your Rxer and Remote Rxer were positioned optimally? Were there any wires or conductive material by them? I once attached a remote Rxer with silicone sealant and it was registering 3 times a many fades as the other two remotes, which were not fastened in place with silicone. I removed the silicone and used servo tape the now the fades are nearly identical on all three Rxers, each flight. Did you have the remote Rxer installed? Did you do a range check?>>
I would rebuild and do a "positional Range Check." (i.e. Have someone move the plane around to all angles, etc. while in the range check) and then read the flight log data. That will tell you if you got things positioned correctly or have an RF interference. I would even try this with the engine running and do it about as long as you ran the plane when the plane crashed. >>
The data log readers are invaluable when you are trying to troubleshoot this kind of problem. The readers are worth their weight in gold, if you are not using telemetry. If you have telemetry going, the Flight data reads out on the DX8. You can use that readout “real time” to gage how far you really can go out there w/o loosing the plane. You see fades = no problem. You see a lot of rapidly accumulating fades = watch closely. You see a couple rapidly accumulating frame losses = you are getting close to the limit. Once you see a hold, then you better have her turning around back to you. A hold registers when you have lost the connection to the plane. Several holds and you most-likely have momentarily lost control of the plane>>http://www.horizonhobby.com/products...ht-log-SPM9540.