So been trying the newest thing where we mess with the journal and codex stuff, and for the most part, it seems to be working pretty well. Had four conversations in an hour (though there was a time before that...still after the codex stuff, that we ran two hours without a banter, so not perfect).
The main reason I'm writing this post though was peculiarity I noticed. In the last half hour (which came after that wonderful hour previous) two of those conversations that we heard recently (both of these between Solas and Varric) just repeated. I'm not sure what this means, but I thought it might be worth mentioning. We haven't loaded, haven't done anything particularly weird (well...besides all the weird stuff we're trying to keep the banter coming). These conversations had to do first with Varric and Solas' presence in Orlais (and the expressions that their presence caused) and after that, about a spoilery event that happened in the dragon age 2 DLC.
Just another audio error to add to the list 
Just wanted to add to this,
Let me explain.
When I wrote this, my roommate had been playing for a few hours and I heard the conversation come up where Solas and Varric discuss the disgusted expressions of the Orlesian nobles. I asked her about it, sure I had heard it recently. She agreed, and I then asked if she had loaded recently. She said she hadn't.
Now, I know I won't always remember when I load, but I decided to take her word on it and write up a message about it, especially as the second conversation I mentioned came up for a second time (another one we had also heard recently). I figured it might be related to the more general bug that we've been discussing. My roommate thought I was crazy because she just thought it was normal (which might say that this has happened before...she seems to think so, and thought it was just to keep the game from getting more silent than it already is).
Now, just 5 minutes ago (after another half hour of playing) the Orlesian message came up AGAIN. This time I was watching and I know she hasn't loaded the game. This isn't some user error, but a definite repetition of dialogue we have already heard, which either means those flags that are supposed to keep dialogues from repeating aren't working on our game, or that something else is going on.
A single banter repeating 3 times isn't exactly what I was hoping for when I wanted more banter (especially since I'm still pretty sure this is supposed to be an early one, and she is 80 hours into the game with these being her favorite characters).
Hope this helps somehow 
Cheers