DDO Artificer Iron Defender Bug

The Artificer Iron Defender pet often gets frozen, rendering it unable to attack. It can follow the player, but its idle animation will cease, looking as if it is frozen. It will attempt to attack enemies and smash boxes, but will be unable to, instead just standing by the target, frozen in place.

There seem to be many situations which cause this. I often find my pet frozen after having travelled in or out of a quest.

One certain scenario when this occurs is as follows:
Go inside a quest with ladders.
Have the pet "climb" the ladder.
Call it using its hireling hotbar, or run far enough away from it.
In either case, the iron defender pet will teleport to you. It will then become "stuck" as described above.