I had 50mb installed a couple of weeks ago and am using a Airport Extreme router. I am having intermittent internet drop outs which appear to be DNS related, the router reports it has no DNS server info, but Virgins DNS IPs are in place. Also I get a message about there being another device supply NAT, but the only other device it the cable modem.
Only resolve is to reset everything a few times until it seem to click back on

Can anyone shed any light on this? much appreciated.