Thumbs down [Q] Lost all saved Wifi - please help

I ve lost all my previous saved wifi.
How is that even possible ?didnt update to kitkat nore done anything related to wifi. From a day to another, or my previous stored wifi where gone. (the "save all wifi" on googles backup setting is checked)

Does anyone know why this happened and how to recever it?
i went to the wpa_supplicant.conf file but nothing is there except some google explanations...
Sony Xperia Z1 Compact - Stock