I just purchased two of these RC tanks, a Sherman M4 Pro and a Tiger 1 Pro Early version. The problem I am having is that when the Tiger first fires up, I can shoot the cannon only once. After the initial shot, the cannon no longer responds, no matter how long I wait; the machine gun works flawlessly though. I have rebound it to the TX numerous times but the problem persists. The Sherman on the other hand is perfect and works excellently. The detail on these tanks is awesome. Has anyone encountered this issue with the cannon?