Same exact error. I just played yesterday for almost 10 hours without issue, log in today and now I'm getting this error every time after about 5 minutes of being logged in...what the heck is going on here?!

Before we get into all the shennanigans posted earlier, i.e. check this or that, I have done everything imaginable to check it out on my end and my full-time job is literally to maintain systems and services on computers for 10 hours a day, 50-60+ hours a week at a state university. I can build, maintain, and diagnose machines with my eyes closed as long as there's something controllable on my end to fix. This isn't on my end unless it's something installed by your patch that's working incorrectly.

I've uninstalled, re-installed, reset my character data, made sure that everything is as you'd like it for optimal performance and such. Explain why the error still exists? As of now I'm nit-picking system services but this makes zero sense and I do not see how from about 1am this morning until about 3pm today something changed when this machine wasn't even online and nothing else is mysteriously affected. Fix it.