Data rate stuck at 35000

I'm guessing its either the DLM, a fault or a combination of both. In the lead-up to this I was getting a lot ofseemingly DNS related errors last week - so not sure if this has influenced the DLM - certain web-pages would pause substantially before loading etc
BT Infinity 2 - installed in April
HH5 never seems to last more than about a day without rebooting/renegotiating, but speed has always stayed at 44-46mb and the 2 noise margins are always between 6.0-6.2
now though - my negotiated speed has dropped to a strangely "round" 350000 and my noise margin is way up - assumingly showing there is still margin for it to be negotiated faster - so why 35000 ?
any help appreciated - thanks
1. Product name: BT Home Hub
2. Serial number: +068343+NQ41060163
3. Firmware version: Software version 4.7.5.1.83.8.173.1.6 (Type A) Last updated 10/05/14
4. Board version: BT Hub 5A
5. VDSL uptime: 0 days, 00:16:13
6. Data rate: 12627 / 35000
7. Maximum data rate: 12638 / 49739
8. Noise margin: 6.0 / 8.4
9. Line attenuation: 0.0 / 20.8
10. Signal attenuation: 0.0 / 20.2
<edit> just found this when searching for faults on my line - so perhaps the work on the below has caused the drop ?
Reported Thu 04/12/2014 at 10:09 PM
Issue Ended Fri 05/12/2014 at 12:33 PM
We've fixed the recent problem in your area. To get your broadband running smoothly again, restart your BT Home Hub. Just turn it off at the mains, wait a few seconds, then turn it back on again. Give it a couple of minutes to finish starting up.

Are BT still using DLM now then ? See :-
https://community.bt.com/t5/BT-Infinity-Speed-Connection/Court-case-forces-Openreach-to-turn-off-Dyn...
http://www.thinkbroadband.com/news/6726-assia-court-case-forces-openreach-to-turn-off-dlm.html
Best regards,
dfenceman

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Profitic wrote:
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http://en.wikipedia.org/wiki/Group_of_pictures
"The GOP structure is often referred by two numbers, for example, M=3, N=12. The first number tells the distance between two anchor frames (I or P): it is the GOP size. The second one tells the distance between two full images (I-frames): it is the GOP length. For the example M=3, N=12, the GOP structure is IBBPBBPBBPBBI. Instead of the M parameter the maximal count of B-frames between two consecutive anchor frames can be used."

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