My Halo 3 memory somehow got deleted and I didn't delete it. Why?and How?

[Dillon C]

I definetly saved it because i had been on the 8th level for some time and i just got the xbox.

 

[alex d]

someone probably deleted it without u knowing.or u probably thought u saved it but didnt

 

[btwist45]

It can happen unfortunatly. My Crackdown game save had a similar problem where the save didnt get deleted but corrupted and i had completed the game . They probably make memory cards with cheap parts

 

[Animal dude]

maybe ur brother or sister deleted it? somebody may hacked it?

 

[DS boy]

you didn't save or someone else deleted it or hacked it