@David-TP 

Thanks.  Yes there is a Virginmedia hub feeding the Deco. Apart from phones and laptops we have Ring doorbell, cameras, Nest thermostat and a few smart lightbulbs/sockets all on a IoT network. 

I have changed the IPV4 to your suggestion. I have already added the TV to QOS as an accelerated client but not enabled scenes. I presume I select "streaming ad media"? DO I then narrow down the apps to those used on the TV?  Household members just myself and spouse but we could be watching TV and surfing on a laptop or  using iphones at the sametime. 

Can you briefly explain the reason for the new IPV4 settings to a layman?

Thank you for your help. I will report back after the weekend on results. 

Speigal. 

  @Speigal 

Well it seemed to have worked for 2 days but now reverted to same problem with the TV displaying an error code and failinng to load Netflix or BBC iplayer. The speed of wif to the LG TV is exceedingly slow on the app.  I have to reboot the Deco and then it seems OK.  I have set the Deco to daily reboot over night but this does not help. Very frustrating but I think the problem is with the Deco and not the LG TV.  Would I be better to connect via the wifi rather than ethernet?

Speigal. 

  @Speigal 

I wonder if Main Deco is too busy and that causes issues.

You said you have Virgin Media hub. If you haven't changed its settings, it behaves as a router. If this is correct, you can reduce load on Main Deco by configuring Deco mesh to run in Access Point mode: Switching a Deco to Access Point (AP) Mode

Main Deco must be connected to Virgin Hub running in Hub's default mode (which is router/gateway).

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Also, in Deco app open info page for Satellite Deco to which LG TV is connected and check two things:

1. You do see LG TV connected to that Deco in the list of connected devices and connection type is Ethernet;

2. This Satellite Deco has good link to Main Deco, meaning Signal is Strong, Medium or Fair. If it is Weak, Satellite Deco is too far from Main Deco.

Example of connection to Main Deco with Fair signal:

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Usually, Ethernet link from TV to Deco is better than WiFi. I have Sony TV and whatever I did, it always had minor buffering issues when connecting over WiFi. I wired it to Deco with Ethernet cable and buffering issues went away.

  @Speigal 

Deco will not run in Access Point mode with Hub in bridge mode, so don't make change I suggested unless you restore Hub to its original mode. 

If LG TV appears and disappears, replace Ethernet cable connecting it to Deco with different one, who knows, the problem may be there. 

These are all recommendations I can give you, maybe someone else could have more ideas. 

One more thing: have you checked Signal in Satellite Deco, and what it says?

Well so far nothing has helped still buffering issues with LG Smart TV. So yesterday I removed the ethernet link to the Deco and simply connected via WiFi. I have made high priority. To day all seems to be working well with no buffering issues! I will monitor and report back in a few days but just wonder if there is an issue with the Ethernet link confusing the Deco until I reboot, which I was doing everytime I used the TV. Of interest the TV is not always selecting the nearest Deco. 

Speigal.