My EpsonL4260 was connected to our wifi network just fine and then it suddenly stopped connecting and wouldn't even see our wifi signal. I turned out that the WPS button on our D-Link wireless router had gotten bumped and all I had to do was press it again (just for a moment, if you hold the button in for several seconds, it will reset the router which you do not want!) and voila! our SSID appeared again and we were connected!