This is usually an indication of a problem between the receiver and the ESC or a crystal. Put in the orignal crystals that came with the tank. Do they fit snug or are they pretty loose????. IF they are loose take an exacto knife and push the metal connections of the socket toward each other. Lick the crystal and reset them. Unplug the three wire harness between the esc and the receiver, and reset them. Try starting it again. Let us know what happens