Iphone 4s Wi-Fi connection problem?

I have an iphone 4s and i was on facetime and then i got disconnected because my Wi-Fi went to 4g, i'm on my computer rn so it's only doing this on my phone, i went to type in my password and then i pressed join and it said to log in AGAIN seriously help

Turn your router off then back on, this should fix the problem.

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