I know this doesnt help, but I was on vacation a long time ago. Driving my Tamiya midnight pumpkin on the beach. And all at once it took off all on its own and SPLASH. It hit the ocean and was on its way out to sea. I got it back but it was never the same. The saltwater and mechanical speed control(yes I'm that old) just didnt mix. Moral of the story is you really need to try hard to find your problem and fix it. A runaway rc is a bad bad bad thing..