I had a funny one recently, I have adsl2+ through iinet for 7 years and had speed of 6.5-7mbits/sec and was quite happy with that. I did however have a lot of static on my cordless phone. Eventually I got telstra to come and sort the problem of the static so they changed the line and it was clear as a bell, then my adsl went down to .15mbits/sec so I thought it must be a new line problem. I got onto iinet and had a tech sent out to check it for me ,no charge to me unless it was a problem with my setup, which it wasn't of course because it was working fine until the line change. It took the tech 2 minutes to find the problem was in fact my ups was not sending power out the phone line (surge protected) to the modern so the modem had no phone line power, ( it may have been hit by a surge at some time) changed the phone line to bypass the ups and now I get 10mbits/sec. So it was the surge protected ups outlet that was my problem. Still can't work out why it worked fine until the noisy line was fixed. Tech told me always to plug into the first inlet in the building to trouble shoot.