Thanks for the offer, asbokid. I am very happy to return it for you to look at, because it would be good to see for sure what the issues are. We can then amicably discuss whether I'd rather have it back again or have a refund. (I'm happy to pay my parts of P&P as well; I think we are both more interested in the technical facts than the cost of postage, anyway.)
I'm pretty sure mine wasn't a spontaneous line fault; partly because the speed went down in stages, and partly because of the consistently high RSCorr rate I was seeing throughout. I've got some stats collected by Bald_Eagle's program (a bit less than a day's worth) which I'm happy to send you first in case it helps sort things out without the time/money waste of posting.
It is also possible that I misconfigured it in some way; is there anything you can think of in configuration that could let it work but cause high RSCorr rate?
We can continue discussion here so others can see the conversation, or by PM/email if you would rather.
Moved (with trepidation turned relief) to BT Infinity 2 for upload speed. Happy BE user for several years.
Edited by StephenTodd (Fri 24-May-13 14:15:01)