I seem to be "lucky" as my line has really benefited from the download noise margin changes to 3db, where the DSLAM believes the line is good enough.
The only downside seems to be that I get re-syncs every 3-4 days on the Hub 5b and this has been happening now for over 3 weeks, beyond any "10 day" training period. Also, they are occruing at anytime, not just in the middle of the night. Is all this normal now?
It may be deemed 'normal' for a hub but if my equipment started behaving like this and I couldn't pin it down to a line problem or other external source I would deem the router faulty and buy a replacement.