Ive had these disconnection issues too and very-very bad lag. I've had to run away from certain zones (I cant go to the hinterlands) in order to try and avoid getting disconnected from what I assume is some kind of overload. I've never had this trouble before 3.05 hit.
Lag spikes so bad that I will be fighting a boss in a fate, I will freeze and by the time i unfreeze it is dead and my whole team is already at another fate halfway done. These lags do follow me into instances as well which can be pretty scary as a healer. And Im constantly worried Im going to start getting the 90k chain again.