Hi m8 tell me youve changed those tamiya connectors over right?

As for the interference could be a lot of things try moving your reciever away from the esc/motor,have you ran it in different places and it doing the same.

Im guessing your running high cap connectors really to be running that low a turn of a motor if your not running deans,trx,powerpole etc then

1) those wires but be getting really hot!!!
2) your connectors could be causing the problem

The tamiya wires wont deal well with that amount of amp pull and will heat up and damage something soon[]