This may be super stupid and dumb luck but I found something that has been working for me at least that has kept the game from freezing 9 games in a row (knock on wood). Being mad and desperate I was trying anything and one game tried waiting about 15 seconds after the game in the post game menu and then hit quit game. When it asked it I was sure or whatever its says I hit no, staying on the post game menu. I waited another 15 seconds or so then hit quit game again then hit yes.
After experiencing the loading screen freeze multiple times doing this got it to load the career menu clean without freezing. Doesn't make sense and could be a fluke but it's been working for me in my offline connected career so I'm going to keep doing it and figured I'd pass it along because I know how much it sucks when it freezes. I was one game away from putting the game down for good when I tried this. Good luck and hope it works for everyone else, glad EA is on top of their game with this stuff and is such a stand up company.
