After about 10 mins of playing in a chopper, AI can't hurt me. I can kill AI but cant blow up armor or take a tower down. The chopper I am using is the only one i can get back other vehicle at all...and if i die, I can't get into any at all. If i get out of the chopper and AI are shooting at me, I don't die but i can shoot them. My chopper takes hits from everything but no damage..also no scoring when this happens. Ideas???