My Internet provider is BT & everything was working fine last night. Today, I appear to have Internet access on my home network but can't reach any websites. I've reset the router & it'll work OK for a minute then stop connecting even though everything seems OK. Also can't get any Internet provided TV channels. I've run network diagnostics which says that there's a DNS server error and I'm trying to reach a server that doesn't exist. Anyone offer an explanation/solution?