The issue occurs on my plane as well as AI for both cannon and guns.I was told it is caused by damaged guns.I noticed when wing area was hit by rear gunner of vals it started and also when friendly flak was exploding around me(although not damaged messages show up) without, I fired a burst at a zero and when let go of trigger, the muzzle flash was still going but not firing bullets, even though I was no longer hitting the trigger button.This happened on P-38 OH as well with both the .50's and the 20 mm.Only solution I could think of if it is related to the guns taking damage is make them invincible if possible.