I went to Apple store today, apparentely the battery "expanded" and that is why my screen popped out. They gave me a brand new replacement on the spot and service was good. I was surprised that after I handed him my device and he came back, he had to do backup for me because he said it was dangerous and didnt want anything to happened. The most important thing is that they replace it.
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I'm using an Otterbox defender right now. I've taken the phone out and used it without the case for days at a time just to change it up. I don't see how these phones could be doing this inside this case. Unless they're overheating. That's the only thing that makes sense.
They suggested I keep using case, they didn't think it has anything to do with it. Oh Well, at least I know they will give me a new one in case it happens again. If it happens again, they will change but if screen brakes because I don't have case then I have to pay for it. Better to use case