>>23431811
I think it's because those sockets/rings for those hinges are too thin. This hinge has slightly thicker walls and lasted longer despite being clear yellow plastic.
>bad luck
That plays a part but minipla and SMP do have a history of breakage if you watch enough reviews. Sad to say but the Candy Toy department just aren't as good at engineering, do not have access to tougher joint materials (Polycaps, Nylon, POM, PC) and tend to overextend. For the minipla line they are also rushing to release a wave every quarter while the show is airing.