Fesevoa

I searched but was unable to find anything matching my issue. I have been hosting multiplayer games for myself and friends to play, both custom maps I've created and stock Warfare maps. The problem we are having is that after a short amount of time into the game, the players no longer are able to hear each other fire their weapons. NPC firing is still audible, as well as explosions, vehicles, etc. We are not using ACE or ACRE. Is anyone familiar with issue and know a fix, or if not, what the problem may be rooted in? Thanks very much!