Sprint iPhone 5, Keeps switching to 3G?

Me & my mom both have iPhone 5's by sprint, we recently moved into a place were we have LTE all the time. But since yesterday my phone keeps switching back to 3G, while hers stays on LTE. What could be going wrong?

That happens to my Verizon smartphone. You could turn on airplane mode and then turn it back off. That usually resets the Wi-Fi and it always works with me.

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