Good, but not durable at all

I wanted to love this case. It is great, I like the feeling when holding it, comfortable. But it is made of some not very good plastic. I am attaching a picture - corners keep breaking all the time. Want to make it clear - I've never dropped my phone, it just breaks like this on its own, normal usage. I bought already 2 of the cases. First one got both corners broken like this withing 2-3 month. Bought another one, one corner broke again. This is the picture of my second case, bought it less than 3 month ago. Looking for another case for my phone, probably it is not going to be this one, as much as I like it, will look for another options...

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