It was reported by BigSquidRc that Spektrums do have less range than more expensive units, but we are still talking 200 metres or so whereas Futaba and Sanwa were good for over 1km!!
Could it be that you have issues with interference? Are you sure that the receiver isn't browning out? Can you run the car with the body shell off and see if the yellow LED goes out at all.
I think the first DX2 systems use the original DSM radio modulation, and the DX3 systems can use DSM2 which should be less susceptible to interference.
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