Occasionally (3 times so far) when I enter a multiplayer versus match the sound will suddenly stop working. If I exit the match sound suddenly returns w/o need for a restart. The reason I think this is related to Command Posts is that thinking back it seems to only happen if I access the command post at the very beginning of the match, and then the only thing I can hear is its incessant beeping... following me everywhere, pounding the inside of my head....*shudders and hides in corner*

This really likes to happen on the Reactor level.

Same issue. Extremely annoying.