I've just purchased a longer ethernet cable for my BT box as the supplied one wasn't long enough. I bought a 5e. It looks ok, but every now and then the screen goes black for a split second. Does this mean the cable is incorrect/at fault? Will it settle down or need I buy a different one.
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That is unlikely to affect the TV screen display, as its only carrying the Internet connection.
I would check the HDMI lead between the YouView box and the TV, in case its been disturbed when you changed the Ethernet cable.
Make sure both ends of the HDMI cable are fully plugged in.
Do you get any messages about the YouView box being disconnected from the internet at all? Does it happen on only internet channels, also if yes does it happen on all internet channels or just some?
I am connected via ethernet and have had very occasional glitching but just the internet connection - It could be the cable - but I would investigate other things like internet speed being enough to handle the internet channels first as a thought - whether someone is downloading a large amount of data at the same time.
It might also be worth checking SD vs HD internet channels.