Since you are not rooted I would suggest doing a hard reset since its only been a couple of days ago that you got the phone. Also check out an app called Fast Reboot, it kills a lot of apps everytime you turn on your phone. Hard reset and Fast Reboot both worked for me when I had that issue. However it didn't work for my other phone and the screen eventually just went black and stayed that way but that's a different story so ymmv.
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