Why does my iphone 5s display keep freezing?

I just got my iphone about a 3 weeks ago. I started noticing that my iphone had been doing weird stuff such as random springboard crashes, dimmer light in the sun with auto brightness off and now the display frezzes for about 5 seconds every 10 minutes my display is on. My iphone is not jailbroken at all what could be the problem?

Take it to the Apple Store, you may have a defective one.

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