This is certainly interesting, and I am baffled.
The only thing that I think could explain this is the possibility that you were on a Broadcom DSLAM before you were moved. I have heard that some people say that the IFTN DSLAM (which TalkTalk LLU and BT 21CN uses) is slow and unstable. Though, this could be wrong, and I would hate to misinform you.
Even though you have stated no hardware changes have occurred at your end, it would not hurt to try a different filter, cable or modem if you have one, as any could stop functioning properly at any moment.
Maybe you have already tried this, but try and resynchronise around midday to see if the statistics turn out any better.
Edited by j3214 (Fri 21-Feb-14 21:29:16)