New iphone 5 keeps lagging and glitching?

I got an iPhone 5 16gb just less than one month ago and it is very slow and it glitches a lot. Sometimes it even freezes all together an I have to turn it off and on. I bought it at the source in the beginning of November. What should I do? I don't want to reset it all as I have stuff on here that I can't lose.

You should probably still reset it. You won't lose your stuff if you make a backup in iTunes and restore your phone to that backup. Will probably fix it.

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