The stock radio is fine, I have been running mine for over a year without a single problem. Make sure that your receiver isn't wet, and you may try unplugging the ESC and steering servo from it, then plugging them back up (do one at a time so you don't mis the connections up) to make sure that you ahve a good connection. Do this with the crystals on the receiver and transmitter as well, and also the bullet connectors on the motor. You may just have a loose connection somewhere. You could change your radio if you want, but many of us use the stock radio and are very happy with it, and have no problems whatsoever.