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The vehicles' chain guns throw out 400 rounds of 7.62mm calibre ammo in a minute.
A soldier in Iraq lost a leg after he was riddled with six bullets fired in error.
But the Army has simply issued warning notices to all Warrior crews telling them to guard against the fault.
Investigators believe the problem - officially termed "undemanded fire" - is caused by electrical short circuits.
But other worrying malfunctions include the turret rotating by itself and the back door opening without warning.
Troops have dubbed the carriers Christine, after horror writer Stephen King's killer car which takes on a life of its own.