Buffering problem .... LG TV (55UM7610PLB)

[Baffledron]

Hi,
Ongoing problem!!
About a month ago I switched from BT to Vodafone FTTP (Fibre) broadband (100Mbps)
Since then I've had buffering on my LG TV (55UM7610PLB). This is connected to the router by ethernet cable.
My first thoughts were to do with the internet connection, I checked and tested everything. Vodafone have also checked everything and Openreach have replaced the ONT. Still got the problem though.
So, I've turned to the TV. The LG chat and phone help were pretty low level and not at all helpful.
Google turned up a possible solution which involved resetting the location services and removing it's automatic status. This sort of worked. Watching UHD Frozen Planet 2 was bufferless. But the next day, watching ITV hub was worse than ever.
You would have thought with an 100Mbps connection it would all work so well....but it doesn't.
Is it the TV? 
Is there a fix? 
Any ideas much appreciated.
Thanks
Ron

[Noel Walker]

As a work around (or another test), why don't you try connecting via WiFi only and just see what happens. 

[Baffledron]

Hi Noel,

Many thanks.

Yea, I have tried that and no difference. 

However, casting to a Chromecast (HDMI) from tablet app does make a difference. It's a 1st generation model that still works and there's no buffering (just a clunky interface).

Is the TV playing up?

Cheers

Ron