My iPhone 5c Wi-Fi isn't working right. Is there anything I can do to fix it?

I just got an iPhone 5c a few weeks ago & the Wi-Fi SUCKS! Safari is really slow, and all of my apps that require an Internet connection (even the pre-installed ones), crash all the time. It's Really annoying. Oh, and it has nothing to do with our internet connection/router/whatever it's called because all of my other devices (laptop, iPad, etc.) work great with the Wi-Fi.

Maybe Wi-Fi module was loose devices

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