I'm new to the RC tank world and built my first Tamiya Panther G. I bought the Spektrum DX5E transmitter with the AR500 receiver. I have gotten everything to work properly following the setup including main gun and machine gun with exception of the tank driving forwards and back with the left stick. If I press the left stick all the way up, the tank engine dies and then restarts. Could someone help this tank dummy out with this problem?