Wi-Fi on iPhone 5S keeps disconnecting?

So I have an iPhone 5S running the latest version of IOS 8.0.2. While I'm watching Youtube videos my Wi-Fi randomly turns off (usually about every 2-5 minutes). I go to Wi-Fi in settings and reconnect by pressing it without retyping the password but it still does it. This problem isn't only with Youtube but mostly on Youtube. Already tryed resetting network settings in Settings/General/Reset. That doesn't help. I also restored my device and it still does it. Any ideas?

Also when I click "Forget this network" and try to retype the password it says incorrect password and I have to restart my router for it to work again.

I have noticed that Apple products have a hard time with wireless if the routers channel width is set to 40Mhz. Login to your router and set your channel width to 20Mhz. If your router won't let you choose your channel width then set your wireless radio mode to "Wireless G".

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