speed passion sensorless bldc stopped
 

my 2 boys are running a set if matched speed passion esc/motor combos
Speed Passion Reventon S Brushless ESC Metal B. Program Box V3.0S 3500KV Motor


Youngest has had no issues. My eldest has gone through 2 combos...
The symptom is the same both times.
First he will need to nudge the car to get it to go, then it will stop all together..
is there anything i can do to repair?
If anyone has experience in this please help...
is it the esc?
the motor?
can i rotate the bell housing slightly?


thank you for reading
Fritz and sons