This is happening to me as well. I started getting disconnected with the 30002 error after the 1.18 patch, but then it was a few times a night at most. It seems now that since around this past Monday~, I've been getting disconnected roughly every 5 to 10 minutes regardless of what city/zone I am in or how busy it is. It's to the point where I literally cannot play the game anymore, it's a bit frustrating.