Reporting in, after a two-day jaunt with the game, about 12 hours in with a new character started Friday evening:
I'm on Xbox One, Deluxe edition. Have the Flames gear in my inventory, but have never donned them.
Consistent music for the first 11 hours or so, although it would only loop for 10-20 seconds or so. Combat music was sporadic. Got horse, have NOT used it, save for one occasion when I tried the mount/dismount/rest trick in an attempt to re-fire banter. Unsuccessful.
Have acquired Iron Bull and Blackwall. Around that time for both of those recruiting requests, banter fell silent. Using all the tricks in the OP, I was getting banter every 10 minutes or so for the first 10 1/2 hours of my game. Then at about 10hrs 30 minutes in, banter reduced to a few one-liners from Cassandra, Viviene, and Solas. I got two one-liners from Cassandra in 20 minutes, on my way to recruting Blackwall. Cassandra and Varric have never bantered yet, although I've had them in my party quite a bit. All companions' discussions in Haven are maxed out.
Can confirm that War Table FT does not work from Haven. Will NOT trigger VR music, and will not re-fire party banter.
After recruiting Blackwall and Iron Bull, I went to the Hinterlands to do some level grinding. Hinterlands have fallen silent. In 30 minutes of play, no banter. Music in 10 second loops. No combat music after three templar/mage fights, and three Fade Rift closings. Have Iron Bull, Sera, and Solas. ZERO banter.
Have stopped at cultists' castle. Solas did make a one-liner comment about them. Iron Bull and Sera silent as church mice.
I have ALL workarounds going, as I have since the character was created.
I'm pretty sure I'm done with the game for one month. Last two weeks of semester (I'm an academic), following by vacation to London for the holidays. Leaving home in the states and my DAI game behind for some time. So no game for me. Fingers crossed that it all gets patched during this next month. If I get an odd moment to fiddle with my 30-hour Skyhold save and my 12-hour Haven saves, I'll report back, especially about any differences in banter between the Skyhold and Haven saves.
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To soul-brothers and sisters in The Sceptr'd Isle, Cheers. Cannot wait to experience a London Christmas. To everyone else, best wishes. Let's all keep our hopes up. I'll lurk in this thread, and will contribute if I have anything potentially valuable to add.