DNS issue on LG Smart TV! Any help or advice would be appreciated.

Greetings all!

I will try and keep it short and sweet!

I am using 3X Powerline 500 XAVB5221. One is connected to the router and main PC, the second to a laptop the third is an LG Smart TV. The router is a Netgear N300.  The PC and laptop do not seem have any issues connecting to the internet - just the TV.

On the TV I am getting this occasional error message after trying to connect and view any of the services - such as Iplayer, NowTV etc.

Network Error (3) DNS cannot be found. Please check DNS server settings or check with your internet service provider.

I have tried a factory reset on the powerline devices as well as exchanging the device connected to the TV.  I have checked what settings I can on the TV but I cannot find anything obvious. I am assuming that is where the problem is likely to be. I may be wrong of course! The TV service does work most of time. It did not work this afternoon so at least I did not have to sit through watch BBC Masterchef on Iplayer.

I am certainly no IT expert so could someone give me a few clues as to where or how I should start the trouble shooting. Any help would be appreciated.