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 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?