I never had that problem with my GT7 till one day, I accidently connect it in a wrong polarity... luckily, I got a schottky installed on my motor, so, I did saved my ESC.... instead of immidiate frying, the motor spun backwards.. then I know it a BIG mistake...
Now, the ESC will give a split second surge of powwer to the motor... other than that... IT"S ALL FINE..... I still can win a race with it...