RE: RC Smart 30A Brushless Speed Controller
Electriceye
I had another brand of controller do this after it arced badly when I plugged it into a lipo. I assumed the pulse may have fried something. So I sent it back. On thinking about it though, the timing might have been reset, something I never thought to check at the time. With your ESC you could check that the timing is either 7 or 15 degrees and this may fix it. If not there is more likely something wrong with the ESC rather than the motor.
Mike