router?DNS fault

[wendyl]

A week or so ago I had a problem opening some web pages and getting a BT message - this was resolved after I contacted my ISP by re-entering DNS numers to router. At the time they said it might be that or a fault with my equipment. After putting in the given numbers all was well until today. I have repeated what I did last week and it seems to be OK again (switching off router for few moments did not cure on this occasion) I now wonder if the router is indeed faulty but would welcome advice from more of an expert than me
thanks

[JoolsTwo]

I think ths may be better on Internet & Technology wendyl