Buffalo routers

I have a few OpenWRT installations on Buffalo WZR-HP-G300NH2 routers that mostly works great, but one appears to have just lost the radio. The router can scan and see other wireless networks around, but mostly nobody can see it apart from sporadic periods where they can see the ssid but not successfully connect. It was working fine and then suddenly wasn't, even after a power cycle. So I think the radio tx is dying or dead... does anyone have any anecdotal evidence of a problem with this particular router, or maybe I was just unlucky? Thanks James