Just the other night, my broadband went down for just a few minutes. My line has been pretty stable around 5Mbps for a very long time, but now has synced at a much higher rate. Normally I wouldn't complain, but my downstream noise margin bounces between 0db and 2db. It's been very stable yet, but I can't fathom out why this has happened. I guess I should consider myself lucky?

(I've checked my BRAS profile, it's now at 6500 from 4500)
ADSL Link Downstream Upstream
Connection Speed 7616 kbps 448 kbps
Line Attenuation 42.0 db 24.0 db
Noise Margin 1.5 db 24.0 db