Did you check the batteries right after the crash ? Could be something pretty simple, like due to the mist, the moisture has cased you intensive current leakage and battery failure inside of your radio, most likely receiver, and associated circuits toward the servos, but could be the transmitter as well, depending how much time they have been exposed to that weather in OFF position prior switching them on. What you wrote that you regained control for short while seems like onboard battery attempt to recover ... Well there could be many more reasons, but it does not seems to be gas-engine related at first.