I was trying DXE today, v489 and I too have the d/c issues. Happened on Toravon, Lich King, etc.
But I narrowed it down to when I d/c. It's whenever I have "Announce to Raid" turned on for the warnings. I can have the Output merely spam the info to myself only in chat, or other chat channels with no problems. But when Announce to Raid turns on, it'll d/c me soon enough.