I've been using a Speedtouch 585 v6 and, by using every trick in the book, eventually got my connection to 3.4Mbps, solid, reliable over many months. However, when I switch everything off to go on holiday it can take a week or two on my return before it settles down, and in the meantime it is seriously flaky.
So I tried a Netgear 3300Nv2. Disaster, Speed went down and down, then it started dropping wireless connections so it went back. The Speedtocuh was plugged back in for a few weeks, speed went up to 2.9Mbps, then I switched it off, went on holiday and when I came back it's really struggling, it's topped out at about 1.9Mbps. meantime I've ordered, received and plugged in a Billion 7800N. It's showing a downstream line attenuation of 61.0, where the Speedtouch shows 54.0. I've tried swapping the S back in and it still shows 54 so I think it's just a different measurement calculation BUT I just can't get any speed out of the line, with either router. If I drop the sn on the Speedtouch it's unstable to the point that it won't connect. The Billion is smarter, it keeps upping the sn until it works.
So what the heck is going on? I think my line is goosed and, short of moving house I'm stuck?