Broadband connection and speed problems

Hi,
   On Wednesday morning my broadband connection went down and could not reconnect from 600am til 700pm. It did manage to get a connection to stay up at around 900pm, but since then the connection has dropped about four times a day.
I have checked my equipment, wiring etc, connected directly to the test socket, using  a new ADSL microfilter etc etc. I have also checked for known problems in my area and have done some quiet call tests(17070).
There are apparently no problems in my area, but a couple of the quiet call tests were crackly.
Since last night (Friday) at around 900pm the connection has managed to stay up but my connection speeds, both up and down are much much lower than they used to be. 
Since Wednesday night I have performed some BT speedtests.
D/L Profile for my line is - 17.64 Mbps, but actual speed currently varies between around 8 and 11 Mbps.
U/L Profile for my line is - 0.83 Mbps, but speed currenty varies between 0.01 and 0.3 Mbps.
Before Wednesday, my download speeds were typically 16-17Mbps and upload speeds were typically 0.8Mbps. 
With very little variation.
I have included some stats from my BT HH3...
Wednesday nights ADSL Line status,  after I managed to get a connection to stay up. below;
ADSL Line Status
Connection Information
Line state: Connected
Connection time: 0 days, 04:59:49
Downstream: 18.65 Mbps
Upstream: 443.9 Kbps
ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.5 Annex A
Latency type: Fast
Noise margin (Down/Up): 4.9 dB / 26.4 dB
Line attenuation (Down/Up): 11.1 dB / 5.3 dB
Output power (Down/Up): 20.1 dBm / 12.9 dBm
FEC Events (Down/Up): 0 / 0
CRC Events (Down/Up): 758 / 36
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 23957 / 6
Error Seconds (Local/Remote): 300 / 4
Current ADSL line status. After the line being up for 17 hours below;
ADSL Line Status
Connection Information
Line state: Connected
Connection time: 0 days, 17:17:36
Downstream: 19.52 Mbps
Upstream: 443.9 Kbps
ADSL Settings
VPI/VCI: 0/38
Type: PPPoA
Modulation: G.992.5 Annex A
Latency type: Fast
Noise margin (Down/Up): 3.2 dB / 28.1 dB
Line attenuation (Down/Up): 11.0 dB / 5.2 dB
Output power (Down/Up): 20.2 dBm / 12.2 dBm
FEC Events (Down/Up): 0 / 0
CRC Events (Down/Up): 133 / 36
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
HEC Events (Down/Up): 636 / 9
Error Seconds (Local/Remote): 117 / 4
One thing that stands out is the Noise Margin of 4.9dB and now 3.2dB. I gather that these values are on the low side. Is 3.2dB acceptable?
I assume my line attenuation values are low as I live very close to my local exchange. I assume that these values are good.
There are some CRC HEC and Error Seconds values. I must admit that I dont fully understand these but I assume these are not good.
One other thing worth mentioning is that the phone cable to my property comes along my front wall over from a neighbouring property. Whilst checking this cable this morning in the daylight, I have noticed that someone, most probably my neighbour, has pulled the cable way from its fixing on the wall in order to put a fence post up on the wall.
The fence post has been there for a few months, with no apparent affect ro my phone and broadband, but I'm concerned that this could have damaged the cable, splitting the shielding or breaking a wire in the cable, or perhaps loosened the connectors to the juntion box it is connected to on the neighbours wall.
Could damage to the cable be the cause of my connection and speed problems?
Also, is it possible that my BTHH3 is faulty?
Any advice would be very welcome.
Thanks
Solved!
Go to Solution.

A little more information.
I have noticed that on a number of occasions when making or receiving voice calls, the broadband connection completely drops. It doesnt happen on all calls, and doesnt seem to happen when just going 'offhook' and listening to a dialling tone.
There is a definite crackle and hiss on most of the voice calls. But only seems to be audible on the home phone.
After a little browsing, I came upon a logging program "Routerstatshub". When I leave this running it logs changes to ADSL stats. 
Looking at the logs, I've noticed that when making voice calls, the upstream noise margin always seems to drop considerably, sometimes down to 0dB.
On some calls, both upstream and downstream noise margin drop to 0dB and the broadband connection drops. 
I have also noticed that upstream line attenuation increases from around 5dB to around 28dB every hour or so. This doesnt appear to coincide with the voice calls. 
CRC and HEC error increase dramatically at the same time as the noise margin changes. HEC goes up by 10s of thousands.
I'm still directly connected into the mastersocket with a new microfilter and no extension cable.
By the way, my connection speeds went down to an all time low yesterday , 1.7Mbps down. 
I have now replaced my DECT phone with a corded phone and will make some more voice calls to see if that makes any difference. 
Any ideas about what the problem could be would be greatly appreciated. 

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