Still getting "Network Disconnected"

Hello,

I have tried a lot of different things now to sort my TV out....it works fine if I use a USB device, and also my WD Live TV Streaming box works fine from upstairs connected to Serviio and the same router....but my F5500 TV is having none of it...I am starting to think maybe it is the the router has anyone had any luck changing routers?

I have just changed my broadband provider to Virgin and used their Router as Modem only mode, and I have a TP-Link N900 router configured for the internet...I have just played a 2hour video without a problem so I hope this is the end of the issue for me.