CO-OP Keeps Crashing & Deleting Save Files

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Halo 5 Co-Op is BROKEN!!
Keeps crashing when you complete the first mission and then plays the cut scene of Hallsy being rescued then BOOM, black screen. Both me and my co-Op partner got black screens, couldn’t press anything to even return to the xbox menu. Had to hard reset. Tried replaying the first mission several times while saving along the way but it keeps crashing at this exact point while DELETING all Co-Op pre-save data, forcing us to restart the first level from the beginning!!!
Just spent over an hour chatting to Microsoft Customer support who tried to wash their hands of it, trying to convince me that the disc must be faulty even though it was brand new and also happening to other friends of mine as well. Their solution was for us to all “Return the disc, spend a day reinstalling and then if the problem persists ask for a refund”. The balls of you cocksuckers. How about 343 stops ignoring this issue on the forums and fix your broken game you bunch of incompetent developers. Ruined Halo & Christmas with this crap.