Why won't Lenovo S850 connect to Wi-Fi?

My wlan sign is just blinking then i went to settings and it just turning on all the time,so I cant connect to wifi.

Hi there. Does this happen to all the phone on the Wi-Fi network or does your phone experience this to any Wi-Fi networks? There are some factors to consider; distance of your phone to router, maybe the Wi-Fi network already reached it's allowed connections, wrong user and pass, or the Wi-Fi network is using mac filtering and your phone is not in the whitelist.

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