I have a Inteno x51671B router modem, and a D-Link DWA-140 USB adapter. My PC connects to the router, but acts like there's no signal, the browser won't connect and keeps giving me error messages about DNS-servers. My smartphone locates the router, but is not able to connect to it. It tries, at best it manages to connect for about two seconds, but then it falls out again. Other smartphones have the same problem. Any idea what could be wrong? Which end I could start at? Thanks in advance.