Siri sometimes doesn't work? (iPhone 5S)?

I received a new iPhone 5S for Christmas yesterday. Everything works perfectly except for Siri sometimes. Yesterday, I opened Siri, but the voice command didn't work, and I was unable to tap the microphone. Siri did work after a quick phone restart, but I'm still unsure what caused the problem in the first place.
Was this just a one time thing? Is there anything that I could have done that caused this?

Make sure you have her turned on in settings? I have the iPhone 5 and it's been faulty.

Do you have sprint

Why is sprint important Shauntia

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