I disconnect every time in the same place: right after talking to the NPC in chains for the 2nd time. I have tried twice yesterday and once today and it happens every time. This instance is pretty long so it's a pain to redo it over and over and disconnecting so close to the end :( EDIT:After the new build I've tried again and first disconnected during the initial fight. Then I tried going straight to portal and waiting for the NPC in chains to finish talking there instead of right in front of his cage and I was able to complete the instance.