Sony KD-43XD8305 loses LAN connection

[dottycom]

My Sony tv is in an outhouse connected to a cable via LAN back to BT router (Fairly new version 6). TV has connected to the internet a few times for 3 day periods then stops  When I change Cable into connection port in back of router it works for 3 days then stops. I have now run out of new ports and old ports no longer seem to connect. 
I have rebooted tv. 
I have tested cable and fine. 
I have  turned off WiFi, especially as signal is too weak (thus the cable). 

do I need to set a static up address in tv setup?

any ideas?

[Anonymous]

Hi there,

Have you updated to the latest firmware?

Best wishes,

M