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Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
Please unplug power to your Modem, for a minimum of 5 minutes.
Replug, wait 5 more for it to start back up, and see how it works from there.
You're very welcome,
if that doesn't help then this is a line/service fault and you would next need to contact talk talk through their website to have them send a technician out to check and repair/replace the equipment on their end.