WiFi was working fine until 10am this morning, since then i have been unable to connect, when i enter the password to connect, it shows as saved, then shows as 'connecting, followed by 'Authentication problem', there is nothing wrong with the router etc. as work colleagues are using the same WiFi and it's fine for them, i have tried using the Sony PC Companion, it said my phone is up to date, so i done a repair/restore, i am still receiving the message "Authentication problem" when trying to connect to the WiFi, how do i fix this?
