why am i haveing a authentication error on my S5

A

AC Question

i got this phone last October and all my other devices (except for iPod touch 4 and WII U that don't have the capability to connect anymore) connect just fine.
settings are
proxy none
IP DCHP
signal Very strong
wpa/wpa2 psk
it started after xfinity cut off our WiFi but the WiFi works on everything else