have you had the router for less than 2 years and have proof of purchase? if so contact Buffalo support for a replacement or refund...
http://www.buffalo-technology.com/support/warranty/
if you've had the router for less than 2 years and its causing nothing but hassle for you then request a refund and buy TP-Links new router >
http://www.tp-link.com/uk/products/d...el=TL-WR2543ND
tp link say it will become available to buy by the end of this month.
http://www.cableforum.co.uk/board/87...b-routers.html