Which should be around the 17 Meg mark as it follows the sync, or are you thinking the modem is not reporting the sync speeds correctly?

It will be on a banded profile rather than being "capped", to prevent it from syncing too low.

capped or banded - the effect is pretty similar as far as this user is concerned, as the top of the band appears to be 17999 when modem will sync at 80 if let to train on its own

I think a lot of instability will have been responsible for DLM limiting the sync speeds, and an engineer visit will be needed to resolve the issue.

IP Profile for your line is - 17.42 Mbps
How should I go about contacting BT? Don't want to let on that I've unlocked the modem as I don't think I'm supposed to.

Don't worry about unlocking the modem - it's your modem after all. If you are worried, you can either do a long reset or just put the locked firmware on instead.

With any "luck" you may hear crackles on your phone and you can report a voice fault, or you can use the online web test to test your line which may also show an error.

Alternatively, just ring the help desk and report a fault and they should send an engineer out.

In reply to a post by BatBoy:

Don't worry about unlocking the modem - it's your modem after all.

Ownership of the modem remains with BT.

In reply to a post by Chris12:

SNR has gone back to 26.4 / 19.4 I'm not sure if this is good or bad?

It's good as it proves your connection is capable of much higher speeds.
SNRM on an uncapped connection tends to hover around 6dB for both DS & US.

It's also good as it proves the connection has been capped.

What is uncertain though, is why the connection was capped in the first place.

It suggests the line has/had a serious fault or a batch of faults, or that you had regularly rebooted/switched the modem on & off for a while.

Quite often, even when "faults" have been repaired, a manual DLM reset is required as it doesn't always automatically restore previous higher speeds.
This type of manual DLM reset can currently only be requested via an engineer's visit & even then, BT's remote fibre centre has been known to refuse such a request.

In reply to a post by MHC:

In reply to a post by BatBoy:

Don't worry about unlocking the modem - it's your modem after all.

Ownership of the modem remains with BT.

No it doesn't. I asked Openreach for confirmation, rather than rely on some unknown posters on a forum.

indeed i have 3 modems now lol