Have you tried some other keyboard?

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If it is moving by itself,press the key of it's direction,like moving around left press left arrow key etc.The same with turrets,Zor X.If you can't shoot or move your turret,or if it seems you go through flags and cant kill refresh the page.

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Sometimes happen. All you have to do is press the key where your tank is moving. If it's moving in the front direction then press the up key once and your tank will stop the movement