I second this issue... I've flown the Huey a long time, and in the last few months, it has become an exercise of frustration when engaging ground targets. If the armor bias is true, why am I often left with gunners which obliterate a convoy of the same unit type, but suddenly "shut down" and refuse to shoot? The unit isn't on fire, still moving to waypoints, ammo is still there, still free fire on all stations, still armed, gunners still alive (as far as I can tell), resetting/cycling ROE does nothing, the attack orbit distance/altitude matter little. I've had right sides deplete their ammo to 0% while the front and left have nearly 100%, even though I give them angles of fire from their position.
List of units I've successfully destroyed, then been refused within the same mission:
-Insurgents
-Armored Speed Boats
-APCs
-SA-8
-Taxiing Migs/F-5s
Sometimes I orbit to no avail, and just land in frustration in front of the enemy, and suddenly after a minute or two they'll "reactivate" and destroy it.
I can understand nerfing damage, or accuracy, or even armor bias... but when you fly a 2-hour mission with a long helo ferry to the objective all set up by your squad, annnnd your gunners refuse to work, it's simply dumb. I'm used to RTBing wiped of ammo, whereas now I often come back with 80%-90% on at least 2 stations and a failed objective.