Do you keep turning the computer off that is running DSLStats? Or closing DSLStats? That would explain the lack of continuity in your SNRM graph.
Re the Max Attainable, which seems basically unchanged since you appear to have set up MDWS a few days ago, the new connection close to you could well have caused that, although we can't see what it used to be of course. It is caused by cross-talk between the two lines. It can happen at any point between the cabinet and you, and even be caused by connections far further on if their line between them and the cabinet is close to yours near the cabinet end.
Many people have seen theirs fall dramatically over time, and those not on full sync like yours have seen their actual sync fall as well. Sometimes by over 10Mbps. Were you one of the first on your cabinet?
Given what your Attainable is now, a re-sync would almost certainly cause a lower actual as well.
See mine: HappyBunny.
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Edited by RobertoS (Wed 07-Feb-18 12:49:50)