Other than being freaked out by all these cracked ds lites. I cannot see how these cracks are occuring. I dont think its because of weak plastic, since they are all manufactured from the same plastic right?
Ive checked mine, and touch wood, there is no cracks to be seen.
I exchanged a creaky screen ds, and the new one makes an even louder snap when opened that the previous one, so I dont think that makes the cracks appear. It simply tells you how solid the hinge is.
That said, the left side of my ds lite is slightly loose meaning it can be moved very slightly, 95% less that the old ds, but it does move in certain circumstances, e.g. if Im trying to rock it.
Perhaps the cracks are a result of the hinge being screwed on too tightly on some ds lites, which puts pressure on each of the hinges when the ds lite is opened till eventually one cannot stand the pressure and snaps, which relieves the pressure of the other hinge, meaning only one side will ever snap.