im having trouble with WiFi Authentication Errors?!?!

[ImYou]

hey all, i have samsung s5 for 7months from tmobile is up to date and last night it was working fine until this afternoon it wont let me connect my wifi and i havent change my wifi pw not even once its still the same as before. i tried disconnecting my modem for 1min then it still giving me problems i restarted my cell, factory reset it and its still saying authentication errors

im getting frustrated over this problem, can anyone help me on this ?

edit: i dont use bluetooth at all.

 

[B. Diddy]

Have you already tried the tips here? http://forums.androidcentral.com/am...roubleshooting-wi-fi-connection-problems.html