Halo 3 difficulty

okay i was playing through teh solo missions in Halo 3 and i had to save and quit so I could go to work.. when i came back it said i have to start all over again... what happened?

Come on guys...If you don't see the two stickied Halo threads at the top, you MUST have seen the myriad of locked threads dealing with Halo and had to wonder why.

Please keep all discussion in the stickied threads or on the Halo 3 board. Thanks.