Zak,
Contact the company directly......from what I understand of the Block, there was a fairly large batch of targets that went out a while back that were not wrapped to the proper tolerances and people were wearing them out and shooting thru VERY quickly because of not having the proper amount of built in friction between the layers.
You may very well have one of these targets depending upon when you dealer received it.
I have the portable one and I have a lot more shots than that into it at MUCH more speed and energy and while "soft" in the center I'm not getting to the fletching yet.