I was having that issue on my NVIDIA 980. I updated the driver, installed GeForce Experience and it resolved the issue. Not sure what card you are using but that's what fixed it for me.
The launcher is even hanging and taking 15-20 minutes to load sometimes today. When it does connect, it immediately reports "login server cannot be reached". I am able to log in at this point and if I am lucky I can get an invoke or one profession slot managed before getting server not responding issues and then kicked…