Game crashes continuing campaign

Playing Halo 4 on legendary on the mission requiem at around 80%+ through the mission, when i try to resume the campaign it loads half the way freezes the crashes to the xbox home screen, had spoken to microsoft support live chat and went through multiple steps, including removing and adding my account back, which didn’t work, after being asked to reset my console i drew the line and didn’t do that, was told to speak to the developer, after stating there was no contact for 343i i was directed to post here, any solution for this? as i don’t want to have to restart over.

well, posting here was absolutely useless, thanks for nothing 343i