Which box do you have as only the 4k box has additional channels delivered via the internet, or do you mean catch-up TV.
Normal channels should not be affected.
Have you tried resetting the power plugs? There should be an accessible pin hole reset that you use when plugged in.
Let us know how you get on and staff will pick this up next week when they are back.
Please remember to mark Solved Posts with Best Answer. Doing so helps other customers and saves TalkTalk's Support Team time by only looking at unsolved topics. Thanks, Steve (a fellow customer).
