For those who have yet to get the game, it seems that when attempting to play the game online in multiplayer mode, there are issues such as “spontaneous match rollback”, “voice effects cutting out”, and “sound effects cutting out”. According to Capcom, these issues are present due to a different netcode used for SFxT compared to Street Fighter IV, which was due to the game being more data intensive.
It is because of this that developers had to find a way to balance sound versus smooth online gameplay. In any case, the issue is currently being investigated, but for those who aren’t too fussed over sound issues and care more about the actual gameplay, then perhaps this might not be such a big issue.