My only other suggestion would be to try a newer Combat routine instead of Trinitys for Demon hunter.
I use to have this very problem Season 2 and i used a DH combat routine for my spec and never had issues again.
Demonhunters and those in italy and vietnam and Russia have NAV problems currently.
Wondering if its to do with Bit Rates
im from the netherlands and how can i use a difference trinity routine can you share me one because trinity x3 is not working for me with svn it gives errors to instal it