I picked up Halo 4 before Christmas and finally sat down to play campaign tonight... had to stop when the prologue cutscene started looping. Even after manually skipping, it kept looping so I restarted my Xbox. I tried installing disc 1 (disc 2 was already installed, and I'd played a few hours of multiplayer in December) but even still the cutscenes continued to loop. I was able to select the level Dawn and then THAT cutscene began to repeat. Still haven't seen any gameplay yet.
Did anyone else have this issue, or have a workaround I'm not getting? Some people said campaign failed to load for them, and while a couple of times I was returned to the main menu, it's mostly just the cutscene looping issue. I haven't come across any other posts about this, so I'm wondering if this is a unique problem.
EDIT - Removed HDD and just used the 4GB storage unit and seems to be working great.