Can't finish the Halo CE Co-Op Campaign

Basically I just can’t finish the Halo CE campaign because right after the finale of the final mission i get booted from the room (on the galaxy screen with all the stars and stuff).
I tought it was my connection’s fault or my mate’s connection and we played and finished it 3 times, he took the achievement and everything but I did not.
Is there any bug affecting the Halo CE campaign?

Never had that before, always worked for me. I will try it ASAP, see whether It’ll happen to me as well.

Hmmm I didn’t get a connection error or boot. but we completed the game on legendary and we were awarded nothing. My comrade shows that he still needs 8 of 10 and I show I only completed up to Halo ( the second level )
Guess im not the only one that was robbed of avatars, achievements and progress.

Hmmm I hhaven’t finished the first halo yet but I haven’t had any issues so far. It wouldnt surpirse me if it was broken, there are meny bugs.I’ll keep an eye on it.

Has anyone had issues playing halo 2 anniversary co-op online? Me and my mates can’t play it at all. It gets to the load screen of any level we choose and fails, taking us back to the title menu. Single player works fine