I’m dealing with the same issues myself, so I’ll put in my two cents.
It happens every time I trigger a loading screen. I.E. changing areas, trying to start an instance, or anything that makes the game reload something. 9 times out of 10 I can’t even get into the game though. I can choose my character and click play, and immediately get the error in the thread title.
All of my friends playing on campus have no issues whatsoever, and they’re all in guilds and doing endgame stuff. It’s pretty frustrating when I can’t even leave the starting area.
I’m going to be patient for a while longer, as I know the team is hard at work and are doing very well dealing with the issues that come with any large launch. I would however like to enjoy this game like I know I will when I get to finally play.