[Buzzbait]

Here's an odd one. I picked up to Shens at Kaybees on Saturday. One car is awesome. The other has this nasty stuttering problem. If the remote is within 6 inches of the car, everything works fine. Any farther away than 6 inches, and the forward, backward, left and right all start surging and stuttering. The car also has an extremely short range overall. I tried a controller from a Precious, and the same thing happens, so the problem must be in the car. Any ideas on how to fix this? I'd rather not return it, as the store was a long drive away.