An authentification error occured when I try to access Internet via my wi-fi connection

[Laeticia1200]

Help! I have had a Galazy 10.1 4G for almost a year. Never had problem to connect my wi-fi account when home. But since yesterday, I have a huge problem : when I choose wi-fi, the tab search and sees my account, recognize it (registered, secured by WPA) but refuse to connect saying that "an authentification error occurred". I tried everything: wrote my password different ways, completely reset my D-Link router and even reboot my tab with the default settings. Nothing worked. I am desperate. Please help!