With UKonline.Xilo and then talktalk come the evenings was having terrible problems
the Downstream SNR would drop like a stone then once it hit around zero lose sync
about 3 weeks ago Western power dug up all the road outside the house found a massive problem with the main power cable that feeds the site and since then the SNR stays around 9-10 and the line on the whole has been much much better.
This has been a problem for about 5 years lol and the powercuts on the site have stopped!! but took them 5 years to sort it