ALMOST every time I got disconnected from an Instance, I will stuck at the loading screen when I reconnect back to the game. In addition, when there is a change scene (e.g. Instance reset or using short cut) which will lead you to a black screen/loading screen, you will stuck at black screen/loading screen for ridiculously long time again. Until you leave the instance, you are back to the normal. I believe I'm not the only one who is facing this issue because my friends have the same experience.