My iPhone 4S keeps crashing?

My iPhone 4S, bought it 2 months ago, has problems. The screen brightness reduced itself without having auto-brightness, and a lot of apps have frequent crashing, even those preloaded like SMS and my phone do hangs sometimes.No, it's not jailbroken, and no external damages. What's happening?

Maybe it needs reset. Or bring it back to the seller, that should still be under warranty.

I'd suggest to do a full restore in iTunes, sometimes they like to bug out just be sure to make a backup before restoring.

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