What's going on with my Halo: Reach?

I don't know why, but my Halo: Reach doesn't work...correctly. The game works, but let's say I want to play in the Living Dead playlist. Well, for starters the sample picture for the map is just blank. Ok that's not a problem, little weird, but no big deal. Let's play on this map! Oh, load failure. Yes, load failure happens sometimes to other people. Mine, however, does it every single time unless it's on Powerhouse, The Cage, and Countdown. Every other map will get a load failure. I tried playing Big Team Battle with my friend and when the map was selected it kicked me out and then said load failure and started to search again, while my friend was still in that lobby getting ready to start. If I try to play campaign or firefight it won't load any maps it'll say "players failed to load content" and my name will be flashing. However, right when I start up the game the campaign will work up until I leave the game. Same with firefight, however, it's a little different. When I first start it up let's say the first map that pops up is Holdout. I pick it and play it. After that next vote is Glacier. Load failure. Corvette. Load failure. Holdout. Works. If I start up the game and play firefight immediately, it'll only work on the one map I played on. I don't understand why it started doing this. The game has always worked perfectly fine up until this point. It has no major scratches, only the tiny little ones that your console will give it overtime as you play it. I tried cleaning it anyways, and still it does the same thing. How can I fix this? I would really appreciate any help with this :/.