Problems with my iPhone 5 I've had since September?

I got the iPhone 5 when it came out. The lock button is broken and when I charge it overnight it doesn't get to 100% and it drains really quickly do mostly all the lock buttons and batteries do this? It only started in June and is annoying! What can I do and if I get a new one is it likely it will happen again?

You can have it replaced for free if less than year.

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