Save problems

Hi there !
My first time here and it’s for a dramatic problem of campaign’s save.
Sometimes, when I save and leave the game for sleeping (Yea, my life is like a infinite cycle “halo/sleep” since the Halo release…), and I come back, I have to restart to the beginning of the level… It’s a little bit frustrating, particularly when you are playing halo 2 in legendary…
I’ve noticed a second bug, more frustrating than the first one (yes, it’s possible), it’s when I played “L’alliance Covenante” (In french, I don’t know the english name), and at the end, in the conversation between the flood and MC-Arbiter, the game crashed… No achievement and no save, just sadness and desolation… And it’s hard to play now with some tears on my eyes…
I’ve an another bug ! (I’m on fire) When, from the game, I go to the Halo Channel application and I come back in game, the game is shut…

I know your priority is the multiplayer mode, but can you fix them please?
Thanks for your work : )

PS: Sorry for my english. If you don’t understand, I will send you a french version (I don’t know if it will helping ^^’)