One thought, it could be the transmitter is the problem. Is the left stick up and down a potentiometer, or simply a two way switch? I'm wondering if its a switch, as there is no proportional control of up and down as far as I understand it. Up is fire gun, down is move gun. Sounds like a switch to me.

If anyone knows if its simply two switches, the upper switch might be jammed on. Let me know and I'll put it apart and see.


Tim