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i'm going to guess a few things.
1. your car has traveled out of it's range from the controller
2. you have frequency from other things in the room messing with your car's frequency and it's causing it to get a read and no read and read and no read.
3. you have some hair wrapped around the gears or motor.
4. your pushing forward and then letting off the button then pressing forward again.
you can choose which answer you like best.
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