As Yindar stated, this is a known issue that we’re aware of. In most situations, it’s very easy to miss the guild screen issue since it doesn’t always disconnect right away and its tied to a very generic error. Unless our team actively checked the characters, it may not be caught right away 
Sorry for the trouble, but hopefully this provides a bit of reassurance that we’re aware and the issue has been escalated to our Quality Assurance team for some time now.
I’ll get this added to our Known issues list as well, but in the mean time. We have a thread here about the issue.