webfred:Hi zizzy
How is your BB set up. It could be there is a problem with the internal wiring in you house. Try this
Put the ADSL line box into the the main BT socket , and plug the router or BB modem in before it hits any wires in your house. See if the problem is any better.
I
The ADSL line box is connected to one and only BT socket in my house. it sounds daft, but there is no improvement or help from anywhere.