Thanks for your post.
We have ADSL from Swisscom and yesterday they "upgraded" our line (np other info provided). Afterwards - no ADSL at all!!!!.
I figured they had screwed up their "upgrade" and spent all day ranting at them down the phone but after finding your comments (I have a Vigor2800) I upgraded the firmware (which was UK 2.8.2 - the latest version) to E.67.36.1 and it then connected perfectly again and has run fine since.
Respect! - You saved me binning my router and buying a new one!