twice now with both my son and my wife we have lost our saved data. At first i thought it was my son accidentally starting a new save game but once my wife had the same thing happen the next day I seen the glitch.
We always "save and quit" then wait until the main xbox screen before we shut down the system. We go to play the next day and our progress keeps resetting to 0.0%, the time on the save still matches when we last saved. I have not found any solution to this saving issue, i'm geussing its with the save itself but i have not found any way to prevent this. re-installing game maybe?