This is where we need to pay attention after a crash like this. If the ESC had an issue it may have been flashing an error code or something.
Thus happened to my Protos mini last year. Doing some big collective pumps and next thing I know its flying on its one. Motor sped up and it took a hard left aileron turn and dirt darted.
Things it could have been
1) servos pulled to many amps. If this happened then the RX would have shut down or browned out.
2) LVC, again possible brown out.
3) Bad connections, going back to lack of current to the RX.
4) Radio, could be many things here. Poor antenna placement ( straight out from radio), weak batteries, interference which would cause a lock out.
that's just 4 possibilities. Would need to know about any error codes on the ESC. I don't think you had any because if you did then you would have said something. Error codes from an ESC will either be flashing lights or motor beeps.
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