I had a similar problem with an RS Pro, after swapping nearly everything it was found to be the Spektrum module in my KO. I had 2 different sets do this on me so i went back to 40mhz and all has been fine since.
Im not saying that this is your problem but certainly worth keeping in mind as you try everything in the car itself.
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{CML Distribution}
{ Penguin Bodyshells} 
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