In the zone chat as well as here in the forums I've seen many postings about issues in Rivenspire. Now I have a character questing there myself, and of course I'm getting similar issues.
At the moment I cannot enter the Crestshade Mine at all, every attempt to do so leads me to the login screen with the message to check out my internet connection, or something like that. My internet connection is fine, I also can load Rivenspire/zone (outside of the dungeon), so yeah, I guess I'm connected. But I get booted when I try to enter that mine (maybe more locations to follow).

This zone urgently needs some "we'll look into it, and FIX it".
I'm playing on NA megaserver.