Posted here before. Thought I would give new update for hopefuls.
I had the party banter bug on all of my previous playthroughs - 2 on PC version. 2 on PS4 version. I did not realize there was a bug until I was almost finished with my first playthrough on PC. I found threads about workarounds, what many call blood majicking. I tried many of those to get banter to trigger. For example, without doing things like war table fast travel, I would have no banter.
After the last patch, my banter finally is working as expected. I played last week and tested it out on PS4. I did not do any of the workarounds. It fired every 10 mins. Took about 10-15 mins to fire once I entered a zone. I had banter after the following - fast travel from anything but war table, after changing party at in the field, while running through zones.
so it is finally working for me. Again, I definitely had a banter bug. Even with workarounds, I sometimes did not have banter for an hour or more.
However, I can reconfirm that Western Approach is still broken. It is still a no banter zone for me. Triggered banter still works but no random party banter. The good news is all other zones seem to fine now - even Exalted Plains. Before last patch, I rarely had banter in Exalted Plains even with workarounds.