Not only does my connection speed drop from 7Mb down to 5Mb, the reliability gets even worse, the lines drops and resyncs half hourly but then it sometimes drops and resyncs every minute. I also noticed that after the change my upstream attenuation and snr margin also now drop to 0dB periodically.
So I ring up CS again and they put me onto an 18dB profile, now this does stabilise the line but instead of dropping every half an hour it now stays up for 7-10 hours.
The line shows no faults and CS seem to think that it's quite acceptable to keep on increasing the SNR margin which I'm obviously not happy, even more infuriating is that I've been running at 7Mb for quite a few years until the problems with the line started some 2 years ago.
Back in July last year, I had a new router (replaced my Netgear DG834N with a DGN1000), new face plate (replaced my ADSL Nation with a BT faceplate), new external junction box and a line fault fixed which I'd been trying to get fixed for the previous year fixed.
Anybody got any ideas or words of wisdom especially as why increasing the SNR margin made the line less stable and why now on the higher margin both the upstream attenuation and SNR margin periodically show as being 0 in the router stats , the provider is Talktalk and I have to admit their general BB service has been pretty dire. Never used to have any problems like this with BT.