@Mr_MustacheYeah, I lost all my progress, which is frustrating, but now I'm replaying the game and I'm actually enjoying myself.
The parts I liked are still fun and the ones I didn't like as much go by much faster now since I come prepared for them. Thanks for offering to help, but it's ok.
After looking around on the internet it seems lots of people playing this game on various platforms have had freezing issues like mine, so at this point I'm mostly pissed off at Warner Bros for not respecting their customers. It's not like I have to fear this sort of thing happening while playing Super Mario 3D World or anything. Bah!