We had problems with 27mHz in a B3, put it down to the carbon in the plastic the car was made from, electrics worked in other cars, moved everything but still interference, changed to 40mHz and interference went away (this was before 2.4gHz).
Not saying it is, but this may be part of it. You can try to move the receiver away from the motor & esc, try different crystals, or go for a cheap 2.4Ghz system. Best of luck with it, I can remember swapping receivers, cables (poor connection?) batteries, motors.............. nightmare
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