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I have had that happen with a bad cable, You could also try to uninstall and then reinstall your Lan card.
If I remember correctly you run other OS's in a virtual machine, You could assign that card to a virtual machine and see if it changes.
Check your routers manual for the specs for those LAN ports to make sure what they are. Then check for a router firmware update.
Hi there
Cheap LAN cables -- I shouldn't be such a cheapskate --especially as the devices sit right under the TV next to the router -- 0.5 metre length plenty !!!
Fixed now -get full spec LAN cables if you want speed --I usually skimp on cables as they are often overpriced for what you actually need but in this case it definitely paid off to change them
Thanks
!!