failing

I have a blx 185 esc in my kraton. I've only ran 3 batteries through it and now it doesn't work. Does anyone know what is wrong?

So I was rc-ing with my friend who recently got his kraton, all is good then I asked the generic question of how do you like it so far/ giving you any problems? And his response was that his servo barley provides any power. He stopped the car and it would hardly turn when the car wasn't moving...