I'm about 90+ hours into the game, I did have the party banter/music bug but clearing out my journal/codex seems to have solved it for me.
So far I've been absolutely blown away by the effort that has gone into this game. When going to a new area I always find it rewarding to go explore in a completely new different direction. For example, yesterday I arrived in Crestwood. I won't spoil it, but whoever designed that level deserves a pat on the back - the atmosphere was amazing, and running around exploring and solving the quests in the area was incredibly rewarding to me. Like when you go into a nondescript cave for no reason at all. There's no quest marker in there, it literally has no purpose. Then you notice how the walls are covered in elven wall paintings. I had to stop exploring for a couple of minutes so I could look at them, and I was baffled. "Why? Why would they put in so much effort into something that's so easy to miss? I almost passed by this cave and I would have been none the wiser."
Even though it's not perfect I've had so much fun playing this game, and I'm not even finished yet. I don't think it's perfect, but it's pretty damn great and deserves the Game of the Year award.