I believe I've been able to narrow this down a bit @Juji with some further troubleshooting.
1. When I logged in after maintenance with my toon, it DC'd after five seconds. I tried about 10 times, always DC after five seconds.
2. I tried again this afternoon, same, but each time I would take that 5 seconds to run out of town. After about five tries, I got out of Giran , and no DC!
3. When I ran back into Giran, once I passed the second lightposts, my game lag spikes for a second, then I DC.
4. When I log back in in that same spot and start to run out of town, I DC
5. When I log back in after running past that spot, no DC
Here is the spot where I am fine, no DC:
imgur.com/a/vcxRnyF
Have repeated this about five times now and always get DC exactly when I cross those lightposts.
So try running out of town to fix your DC issue, it works for me.