Hi SublimeMarauder
Can you try enabling bridge mode in the router and static IP in the YouView box..
Log into the router at 192.168.1.1 - Username : admin Password: admin
Note : Password is admin for the HG635 but will be a unique password for the HG633 and can be found on the sticker on the rear of the router.
When logged in, copy and paste the following link in your browser : http://192.168.1.1/html/advance.html#iptv
This will display the TV settings screen.
Under 'Advanced TV Setup' put a tick next to 'Enable Advanced TV'
Set the connection type to Bridge Mode then click Save.
Next, on the YouView box, in the 'Settings' Menu go to 'Network & Internet', toggle to Manual and then use the following settings:
IP address 192.168.1.100
Subnet mask 255.255.255.0
Default gateway 192.168.1.1
DNS 8.8.8.8
Save these settings then retest.
Thanks
Karl