Having same issues with ATT Galaxy S8 Active. Connected to Netgear ORBI routers in house. It's been happening quite allot lately - daily. I have to turn WIFI off and then on for the phone and then it connects - else "WIFI Authenetication Error". No other cell phones in my house are havinging this issue... iphones, and S7 active. I just removed the ATT WIFI app - will see if that helps at all.
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