I've had Infinity since November 2011, with a speed of just under 38Mb on installation, 71Mb on the switch to 80/20. In the last month I've seen about 8Mb lopped off, and today I find I'm on a profile of just 38.4Mb. Basically back to where I was on installation. Is there any point in raising this with BT, or will I just get fobbed off with what I have now being good enough?
Unfortunately I don't have a flashed modem, so I have no line stats. It never seemed worth the effort given that it just worked. I expected to see some speed loss due to crosstalk, but this seems way beyond that.