There could have been some incident that caused it, and a simple turn off of the modem
, then back on after a minute wait should cure that. I recommend doing that inside daylight hours. Don't do it many times!
It might be better also to turn off the router, and turn that back on after the modem has connected. It is possible for routers to get confused or clogged up as well when out-of-the-ordinary events occur.
Another possibility is that over the time you have been on FTTC there have been several more connections to your cabinet, and the latest one was the straw that broke the camel's back. It is quite common for later connections to cause cross-talk with earlier ones, and once that reaches a certain level, (like noise on ADSLx), there has to be a lower speed re-sync. There's nothing you can do about that, but there is something called Vectoring
being looked into by Openreach. That's a system to cancel out cross-talk.
The third possibility is similar to the cross-talk one above, where error rates on the line have caused interleaving to be turned on. On FTTC that reduces the sync speed. If the noise was temporary then several posters have reported it being removed after a couple of weeks or so.
There is a sort of consensus that the pre-connection estimates on the BT Wholesale site take account of forecast cross-talk.
My broadband basic info/help site - www.robertos.me.uk
| Domains,website and mail hosting - Tsohost
Connection - Plusnet
UnLim Fibre (FTTC). Sync ~ 54.2/15.2Mbps @ 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.