Everytime I start the mission "Alliance, the sound cuts out about halfway through. The cinematic continues to play through till the screen goes black. If I leave it this way I can hear the audio intermittently come back as if it is trying to continue to play the audio that failed. I have been sitting here waiting for the game to continue to gameplay (the little loading circle does continue to roll in the lower left corner). Is there any way to bypass this so I can just continue through the campaign?
You could try doing a hard reset of your console and then running that section again, but I think you may need to reinstall the game
Before doing that though, if you were mid-mission (even at the beginning of the mission) and had done an update previously, you need to restart the mission. That may help resolve your issue.