Les Jackson

I hope there is not a duff batch of discs,why else would several people have load problems with levels on the game during campaign? does it have to connect to the servers for some kind of info and thats causing the issues? I'm seriously confused right now.

I'm playing through the game and had just got to the point where master chief jumps through the porthole that Cortana opens and....i get the Halo 4 start screen again telling me to press start? i go to campaigns ,select the missions i have played and try to start Forerunner,it says it's preparing the game...loading etc..etc but seems to fail and after several attempts to load i get the "one player may be missing downloadable content"?? whats going on? do i need to load the second disc for campaign as well oor just multiplayer?