IPhone 5S not connecting to home internet? - 1

I have a iPhone 5S. I bought it from my local Apple Store. This iPhone doesn't wanna connect to my home internet. All my other devices are well connected to my Wi-Fi. When I go to settings on my phoneI could see my network name. I click on it to enter my password & i'm positive that I'm entering the correct password but every time I enter the correct password it says "Incorrect password". I have restarted my phone, still doesn't work. I had restarted my network settings on my phone. Still doesn't work. I had tried both but the problem stilloccurring.
This phone connects to different network names just fine! This only happens when I'm home. But the crazy thing is I connect after I try to put the password in for like the 20th time. This is really frustrating. My other devices just connect to my home internet at the first try. When I leave my house and come back my phone isn't connected to the internet anymore. I have to try to put in the password so many times. Once in a while it connects. At first I thought it was the motor of my home internet. I had called Apple and they told me that the security settings on my home internet are blocking the connection to my iPhone 5S. But all my other devices are fine! So I called frontier/AT&T (internet service provider) they told me that there's no way to block a connection to my iPhone 5s. So I brought the phone back to try out a different 5S & the same problem happened! So obviously it's the motor problem so what can I do, somebody please help?

After confirmation switched off and on the phone. Think it will be work.

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