Assuming this should go in the generic fibre forum as it's more of an OpenReach FTTC DLM issue than related to my specific ISP? [Mods please move it if you want]
ISP: BT Retail
Package Details: Unlimited BT Infinity 2.
Estimated speed given when signing: 51.5Mb/s.
So I've had BT Infinity a while and have now got used to it. Speedtest result when the connection first went live was about 55Mb/s download and 17MB/s upload. The IP Profile was 57.1Mb/s download and 20Mb/s upload.
After a few weeks speedtest results went down to 52Mb/s, and from looking the IP Profile had gone down to 53.89Mb/s download. So that's pretty much spot on the 51.5Mb/s estimate and I'm not complaining, that's fast enough for me! The upload speedtest and IP Profile both stayed the same.
It then stayed perfectly stable at this speed and up until now I've been perfectly happy - loving that FTTC is finally available on my exchange (I thought we were never going to get it!).
This week (Thursday 3rd October at 1PM) for some reason the connection dropped and then came back online with a new IP address. Don't know why it dropped suddenly when it never normally does and is perfectly stable, but for whatever reason it did (there was an OpenReach van next door if that's any coincidence?).
Since this drop, the pings and upload speed are fine. But... the download speed has taken a nosedive. Speedtest results are now 35Mb/s.
Doing the BT Wholesale test I can see that this is because my IP Profile has been knocked right down. The IP Profile now since Thursday is 36.7Mbps, down from 53.89Mb/s before (but the upstream profile is still 20 Mbps).
So obviously I'm not a happy chappy that one loss of sync on a previously perfectly stable connection has reduced by IP Profile by over 17Mb/s!
So the question is... what can I do to get the speed back? I guess the IP Profile has to be reset somehow?