Hi alex
I have the same TV, and was having exactly that Netflix problem.
The fix which worked for me was to change the network settings for my TV, giving it a Static IP address of it's own, within the range of IP's available, but not an address given out by the router DHCP.
My router, like all routers, has a range of IP addresses available, and normally it allocates these to your connected devices, from the pool it has available.
These are 192.168.1.1 to 192.168.1.253 for me, but I have reserved the addresses from 192.168.1.201 to 192.168.1.253 for static addresses in my home network.
So, I use one of those, in my case it is
IP Address: 198.168.1.210.
Subnet Mask: 255.255.255.0
Gateway: 192.168.1.254 [Router IP address]
To access these settings on your TV, go to
Settings/Network[Globe]/Network Connection......
OK Network Settings......
click Start Connection
You will get a Network Connected message....
then choose [and OK] Other Network List....
you will then get a list if you have more than one connection [Wired and Wireless].....
choose Manual Setup...
here I choose Wired, and I haven't tried any other method, because I can then choose IP Mode Manual Input to input the settings I mentioned earlier [IP/Subnet/Gateway].......
Also, DNS Server for your provider....[also useful for changing where the TV thinks you are, for example getting US Netflix, etc]
You will get all those settings from your Router information, the settings above are mine, for my old Netopia router in Ireland......
Sorry for being so long winded, but this solved Netflix for me, and it streams beautifully now.
Hope this helped, I welcome any questions, and will attempt to answer.