I've never had any freezing issues personally. I've made it through the Champion & Legacy mode with having any of these problems, so it's not all game related. I'm not sure its your disc if you've installed it to the HD. It should read the majority of the information from it.
Haven't heard any suggestions even from other games that would be helpful here.
I agree with them needing to fix freezing issues quickly though, happens ALL THE TIME on Fifa 11.