Wish you all the best. I hope my experience with this will benefit others.
Hopefully once G.INP kicks in again I'll sync closer to 49 Mbps then think about downgrading to BT Infinity 1 (not to keen on the 12 month contract).
Waiting for my Zyxel router to arrive and perhaps I'll fit an MK3 faceplate. I might even break 52 Mbps.
You need to wait 24hrs as that's when DLM will kick in again and then take about a week to stabalise.
When DLM is reset all restrictions are lifted and the line runs in "unstable" mode (for want of a better word). DLM will monitor it in that period and then take any action it sees it needs to to stabalise the line. It could be too agressive in the first instance and do multiple resets until it gets it right.
Be prepared for fluctuations over the next few days. It's totally normal until the line stabalises.
My problem's back again....
I mean, they've already done a line pair swap but the problem has surfaced again...after 4 months or so...
Crackling/hissing noise on line (goes away when modem isn't connected, sounds like the VDSL2 signal is bleeding into the voice part).
SN margin drops to nearly 0db when phone line in use/call received, sometimes enough to cause a disconnection.