@justtayunicorns You'd be surprised just how damaging dust can be on a console, or just electronics in general, so it pays to regularly clean your consoles as best as you can. Just a few other tips that may (or may not) help. Try keeping the console in a more open area so you don't restrict airflow, and do not do anything to block the vents. Avoid hot places, or setting it on surfaces that can really absorb heat like carpeting or rugs, because heat can be killer on electronics too. Don't set things on top of the console, at least not while you use it, not sure if that one is all that important but might as well be safe.
You may do some of these things already, but just wanted to try suggesting some things in case it could help. It very well could just be the game though, because lets be honest this game is a mess in its current state and is typically a mess anyway.
One other thing I'm curious about, how old is your PS4 and how much do you play it? I ask because some of what you say reminds me of how my games would play on my PS3 when its hard drive started to fail. Long loading, certain things failing to load, freezing, those could be signs of hardware failure. Do any of your other games show similar problems? If not I wouldn't worry about it being hardware failure.
Personally I would lean more towards it being the game, but it never hurts to try some things to help keep your console clean and cool.