This bothers me as well. I tried fighting modremoth 10 times over, and mid battle I would get disconnected. Tried on multiple computers... same thing. I went in with a party of guildies.... and I got kicked but they finished it. I've given up on that. With PoF I was hoping I wouldn't face this random disconnect issue, as LW S3 seemed to run smooth. But first instance fighting the herald of balth, guess what disconnected. 2nd run through it went through just fine. Never happened in the core game.