Ensure that the AA functions properly;

As Jap and not only, if fired rapidly, AA failing to shoot even when loaded with ammunition.

Overheating?

I do not think. It just stops firing without any warning while it still has ammo

Reloading the magazine?

No need of any fix :-1:

AA cannons (Japan’s and others) work fine :ok_hand:

provide video of the problem. it seems like you have overheating, but could be something else.

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