My iPhone 5 vibration isn't working. I have to reset to get it to work?

I got my iPhone 5 on release day. I always have it in silent and the vibration on. Lately, it will stop vibrating and I have to shut it off and turn it back on to get it to work. Is this something covered under the warranty? What should I do?

I would take it to the Apple store. It's the best way I guess.

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