I have now purchased three of these trees for my three cats. The first one lasted about two years, and I had no problems with it-- just the natural running-down that happens with frequent use. The second one lasted about a year, and the faux-fur on the platforms started to come up. i thought is was from the cat's claws, or perhaps because I vacuum the tree every week. But I noticed that the second time I've vacuumed this 3rd one, the carpet is already starting to come up! The structure itself is strong, but the glue used is VERY weak, and I'm disappointed. This used to bring my babies so much fun, but I'm worried about them using it, now. What happened?