just got my s5 yesterday im having the same problems at home, other computers are working just fine other phones work but mine just says (saved,secured)
i have tryed every thing i know checked every board i can think of and serched google and bing cant find the answer.
the guy that set my phone up wifi transfered my stuff from my s3 to this one in the store and it auto downloaded all my apps with out my wifi at home im allready over 75% data used in one day usually only use 45% all month. i can find a fix for this and im getting irratated because it will be costing me money soon!