How to determine if the ESC of JJRC C8805 RC car is faulty?

If the speed of the JJRC C8805 RC car is out of control, for example:
1. Sudden acceleration, deceleration or inability to adjust the speed;
2. Or the temperature of the ESC of JJRC C8805 RCV rises abnormally during operation, or there is a strange odor emitted;
3.and the phenomenon that the indicator light flashes abnormally;
It is likely that the ESC of the JJRC C8805 RCV is malfunctioning and requires further investigation or contacting the after-sales service of the JJRC C8805 RCV.