@Pdg66
Below are some standard things you can and probably have done before calling the team.
Have you done a factory reset to the router indicated in the link below?https://help.nowtv.com/article/improve-broadband-speed
You need to call the broadband team. See link for number.
https://help.nowtv.com/article/how-to-submit-a-broadband-complaint1
This link also shows any planned outages as well wide spread faults.
https://help.nowtv.com/service-status
To me it sounds like an issue with the line somewhere. Which is managed by OpenReach.
FYI that I do not work for NOW, just a NOW customer trying to help
