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I've had the exact same problem since yesterday morning too.
Did you have any luck getting yours sorted?
Apologies for the delay in responding. If you're still experiencing an issue with your broadband we'd suggest calling our Technical team on freephone 1907 (option 2) when you are at home with your modem available to test as they will be able to troubleshoot this with you directly over the phone. Our technical team are available Monday - Friday 9am to 9pm and Saturday/Sunday 10am to 6pm.