I dc'd immediately after my second try at killing Balthazar. Right after he died, the cutscene started, but all I got was a black screen for a few seconds and then disconnect. When I reconnected I was taken back to the beginning of the fight. Too frustrated to try again now, but at some point I'll go back and try some of the suggestions in this thread. I hate that fight. Like others in this thread I don't often do the story material as I find some of them too long, with too many parts, sometimes life intervenes and having to redo the whole thing from the beginning is soul sucking.