For issues specific to Samsung's Touchwiz interface (a custom user interface and feature-set designed by Samsung for their touchscreen devices).

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How can I fix the Wi-Fi button or prevent Wi-Fi errors when turning it off and back on?

Sometimes after I shut off Wi-Fi using the button inside the notification bar drop-down, I can't turn it back on with that button. Hitting the button does nothing, it's not even highlighted. When I ...