Sensor board problem?

[Chop chop]

Have been racing tonight and every time about half way through the race, the car stuttered Bad and ended up getting to the stage where the throttle did not work at all.

Motor is new sp 7.5 and a helpful chap at the club thought it could be the sensor board on the motor. I tried a standard 13.5 motor for the next raced had no issues.

Anyone else experienced this ?