Good Afternoon @Celiagreig, thanks for your post on our Community Forums, and welcome back!
Sorry to hear of the landline issues you've been experiencing.
I've looked into the local area and cannot see any local issues effecting the services.
Can you please confirm if you handset is connected to the master socket or via an extension socket?
Are there any pieces of equipment connected to the extension sockets on the phone line?
Kindest regards,
David_Bn