I got smashed in game and cannot hold myself flying straight using my mouse without it disconnecting me within 30 second.
It is most likely an exploit prevention mechanic, but it is really annoying trying to fly and needing to constantly reconnect to the game because of the drunken movement being cancelled so many times.
I was having the same issue yesterday , getting dc every 30 sec if I flew “drunk”
Maybe its blizzards silent way of saying don’t drink and drive? you’ll disconnect / crash 
You don’t even need to be drunk, necessarily. I’ve noticed that, if you whirl the camera while moving around on a flying mount too fast, it auto-disconnects you.
This was especially annoying when I was flying a Frostbrood Vanquisher in the DK starting zone (during the quest “An End To All Things…”).
Incidentally, the auto-disconnect seemed partially influenced by mouse DPI. Rather, when I turned my mouse DPI wayyyy down (like, down to 800 DPI or less), the auto-disconnects stopped.