Transparent Slim Case might be low quality - Fairphone 2

Two weeks ago i bought a transparent slim case for my FP2. Crazy as i am, because who the hell is willing to pay more than 30 Euro for a simple piece of plastic. But now, the case is showing cracks and fractures at two edges. And this without any reason. Has anyone made a similar experience? Could it be, that he material of the transparent case is low quality? This would be very annoying.

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