Plusnet reps here have occasionally dealt with similar, that turned out to be "an imbalance" in the BT Wholesale system. They were able to get it sorted out.
The nearest theory we have got to what they mean is that the BT IP Profile is held in two places, with the second (that does the actual throttling) being updated from the one that is reported by the BT speed test, and that the update to it sometimes fails in the same way as the Plusnet update does. Probably not for the same reason, but the same effect.
My broadband basic info/help site - www.robertos.me.uk
| Domains,site and mail hosting - Tsohost
Connection - Plusnet
UnLim Fibre (FTTC). Sync ~ 56.6/14.1Mbps @ 600m. - BQM
"Where talent is a dwarf, self-esteem is a giant."
- Jean-Antoine Petit-Senn.
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Edited by RobertoS (Thu 31-Jul-14 16:28:48)