A little more than occasionally my tank will not move. I believe it is a lag issue. After 30 or 40 seconds my tank tries to execute the joystick commands that I had been doing while it was frozen, or it will display my tank destroyed.
Everything else seems to work. The turret rotates, the gun fires, auto aim works, even the animation of the tracks moving works, but there is no movement of the tank. If I double tap the home button and kill the app, start again sometimes I can do this fast enough to regain control and not get blown away.
It costs me credits each battle that this happens and it is extremely annoying.