So reducing your ilvl while in a duty queue will cause the queue to expire

[Kaze3434]

If you want the full rundown, here's how it happened

I was in Azys Lla with a few friends, checking out the changes to the Warring Triad. We've been having issues trying to queue into Void Ark because people kept leaving (same crap as always with 24-mans). After she did a new queue (like maybe 7-8 minutes after), we started messing around, culminating in me stripping down to add to the humor. Then I ended up getting a message like 'insufficient ilvl' and the queue cancelled.

this most likely happened when the queue actually finished, and checked for who was ready. if you were on the job that you had queue as, the check would stop there, but it saw your ilvl was too low, so kicked you.