well i haven't been able to find any fix for it, i can't imagine why they would ship the game with a bug like that. And i've seen it posted everywhere and not one work around, other then ps4.
Only just started the campaign, shut down the stadium it took 2 minutes to load and I am back playing, must be an Xbox Issue. I am on PS4 by the way.
i've read it affects all consoles, it gets stuck loading at like 25% and at 90%, and it could because of the uplay additions messing up the gamesave to make it unreadable, so when ever you leave the game go to a safe house and sleep to make sure it saves, i've had issues with it for a few days now, and the only kinda work around is to play something else, and wait a day lol. so it defiantly sucks and their is also to many bugs for a game that was delayed for so long and still has so many issues