My iPhone 5 is really messed up?

So I got my iPhone 5 in June and it has worked fine. But recently the 3G won't work and whenever I get on Wi-Fi it will barely stay on it! It's a bit glitchy and crashes a bit, too. Like today I was on it and it randomly switched to the black screen with the apple in the middle. What's wrong with it? What should I do?

Try a factory restore.
if that doesn't help take it to apple.

That's what happens when Apple releases their products so early because of customer demand. I bet when the iPhone 5s comes out all the glitches will be fixed, somewhat how the iPhone 4s worked expect for the nightmare called Siri.

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