How to stop my phone from constantly rebooting?

I just bought a Lumia Windows phone and 3 days later it's constantly rebooting. Today I found out why it keep rebooting. I turned on my WiFi and my phone just froze and starts to reboot over and over again. It be doing it for hours and I don't know how to fix it. Somebody help please! ðŸ˜Â"😣

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