This is a 5 second possible solution to Wifi connection issues. I am using a Galaxy S4 in this video but it should work for S3, S4, S5, and Notes 2 & 3. These possible fixes will probably help about 30% of you.
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Two Possible fixes:
1- Unplugged router and modem, wait 1 minute then plug them back in.
2-Go to:Settings, wifi, menu, advanced, uncheck ""Check for Internet Service" or "Auto Network"
Please note that it may differ a little from phone to phone. Again in this video i am using a Samsung Galaxy S4 Tmobile version (USA).
This should work for some of you. If not, im sorry.
disconnects from my Wi-Fi connection and automatically connects to mobile data network
connection keeps getting cut off
wifi is unstable,
cant connect to my wifi router,
refuses to connect to my wifi source,
problems connecting to a Wi-Fi network
Internet connection is slow, constantly drops,