There has been a problem with your digital signal either being weak or lost.
Things to try:
Check your cable connections
Check all your cables are connected correctly and securely, in particular, your aerial cable both at the wall and also into the back of your YouView Box. If you are unsure about how to connect your equipment - see our set-up guide.
Use our Availability Checker to confirm which digital channels are available for your postcode. If the problem channel is not listed then it may not be available to your area. If it is listed, then move on to the next step.
Check for interference
Has there been any recent changes inside or outside your home, for example have you moved or introduced any electrical appliances or devices or is there any building work going on? These issues can cause electrical interference with your equipment.
Extreme weather such as heavy winds or storms can also affect your signal. Check if your roof aerial has been affected / moved by any recent severe weather. If you have been affected by any of these issues, the BBC's website provides further details on what to do.
Restart your YouView Box
Try restarting your YouView Box and router to see if this fixes the problem. Simply switch off the power to both devices, wait 30 seconds and then switch it back on again.
If restarting your box didn't fix the issue, try a channel re-tune.
Press the YouView button on your TalkTalk remote, navigate to Settings > TV Signal & Quality > TV Signal Quality. If the signal quality is less than 80% then this is likely to be the problem. A weak signal could be related to the type of aerial you have. You could try connecting the box to another aerial port in your home to check if that makes a difference.
Internal aerial - in most cases the signal quality may be too weak.
Communal aerial - you will need to contact your landlord / Housing Association.
External aerial - you may need to contact an aerial engineer.