The infamous Skele DC.

Wow, I thought I was the only one with this problem. If it helps, I circle the skele map using blizzard. At the bottom I would use chain lightning to gather the monsters and make big groups. I would be able to kill the big group with no problem (I 2-hit skeles btw). Usually I would cast blizzard a third time to try to start cleaning up the few skeles that have spawned on the bottom and right after I cast it, I would d/c. It seemed to happen the most during the 36-hour 2x's event they had. I've since stopped mobbing monsters on the bottom and just do what I can with blizzard, even if it wastes a few more pots than usual and I don't d/c as much. I've even went some whole four hour shifts of 2x's without d/cing once.