I’m having exactly the same issue: after a few months of inactivity I decided to come back on GW2 buying the new expansion pack and I’m having this “surprise” all the time. I wasted an entire day looking for a solution but nothing seems to work. It isn’t a computer issues (the computer is pretty high quality) and it’s not a problem of connection. And it doesn’t happen on any other game. Please, let me know if any one finds a solution, I’m going crazy!