I have been playing Magic the Gathering: Duels of the Planeswalkers for a long time. I have all three expansions and unlocked every deck to play. I only have about fifteen cards left to unlock for the entire game. I was at about 96% or 97% complete. The last time I tried to play the game however, it had my progress with no decks and no cards unlocked. It showed me at 33% progress. I looked and my achievements still show that I should be much further along in the progress (beating the last decks of the single player campaign).
I do not understand why my progress would be erased. The times before it was erased I was playing with a teammate on the same xbox and his progress is still intact.