The infamous Skele DC.

Just throwing it out there:
in KMS, the minidungeons will occasionally "Lie Detector" you to check if you're botting. It will occur at a random point (But generally not in the first 15 or so minutes) and ask you to type a word. Unfortunately for me, it asked for Korean in KMS, so it meant I'd get sent back to town every time, thus rendering the minidungeons useless to me.

Could it be that the skelegon minidungeon is trying to call this Lie Detector script, failing, and disconnecting people?

one way to check this is to see if your whole party DCs. if you're all attacking in the mini dungeon, the lie detector will come up to everyone at the same time.