This just started happening tonight. I was playing with 3 friends doing a mission and after one of the checkpoints one of my friends asked us if we could hear gunfire because he had a steady sound of automatic fire following him where ever he moved even though there were no enemies and none of the rest of us could hear any gunfire, he ended up logging out and back in again and it stopped. Then after 2 of my friends left the remaining 2 of us went to do some control points, we fast traveled to the South DZ entrance and when he spawned in he said he could hear a helicopter, I couldn't hear it though, and just like the automatic fire our other friend heard earlier this sound of a helicopter followed him around as we explored the map, again logging out and back in fixed it. Then after he left I went and did a hostage event, I used my turret and after it was over I could hear what I think was the sound of my turret rotating, and again the sound followed me all over the map.