This happens in about half of story instances for me, and has occurred in instances from the personal story, living world seasons 2&3, HoT, and now PoF (I haven't done season 4 yet; mostly because I have had to waste so much time replaying every other chapter because of this bug). It seems related to the triggering of a cutscene, as others have mentioned, but the silly advice of moving my character or trying to use a skill is useless because the cutscene never actually starts. As soon as I get booted to character select, I can hit play and get back immediately without having to log in in the launcher. If a disconnect is happening, how am I able to log back in without authenticating? Either the disconnect message is a lie, or this is a HUGE security hole. I've tried a client repair, reinstalling the game, lowering my graphics settings, reformatting and reinstalling Windows, and even playing on a different computer on a different internet connection from a different ISP; This issue is NOT on my end. EDIT: also worth mentioning that I'm connected to my router via ethernet, so this is not a wifi-only issue.