ORIGINAL: plugin
It's a 4 cell pack. It showed 5.0v under load. I will see how can I get the antennas to be further from the battery and I will try to position one vertically as you said. Thanks a bunch.
While not an absolute requirement, Futaba generally suggests using a 5-cell pack with the FASST radios. I suspect you may have hit a low voltage battery failsafe condition. Under load of the servos you may well have had the voltage drop far enough for that to happen regardless of what you tested after the crash.
BTW - what load was on the battery when you read that 5.0 volts.