i had wifi issues. i have a dir-655 router and my n900 didnt work in a wpa2 only mode. i to set up the wpa2 cipher to aes instead of tkip or aes/tkip. there seemed to be issues with my wifi on n900 until i changed to settings on the router. if that is not doable then add the access point from the settings menu and dont check wpa2 only mode. hope i help.