I have the same problem, but for me its worst.

I made a building design, and needed to put like 500 windows. I have made a DC so I can simply tell the the windows is open or close with a combobox. When I change the "state" of the window it creates a new instance with the #n.

In a very short time I will have 500 components in my model, turning impossible to get a list of quantities.
For me it loses all the purpose to have a DC if it not remains unique despite the internal state, like you see in AutoCAD dynamic blocks.