Problem Error Rate

[#1]

Referring to my one of my previous posts, several weeks ago something changed on my line. Normally I get a good usable connection around 5000-6000 crc errors a day with hec errors running about two thirds of that. Pages loaded fast with no problems. I had interleaving turned on which reduced the errors to a few hundred.
That lasted a few days then a number of times I was disconnected in the evening and unable to reconnect until around midnight. I was sent a v8 to replace the v7 and that connected but that's when I noticed the vastly increased error rate. Sometimes it's like a switch is being thrown at around 7pm and for a few hours the line often becomes unusable. HEC errors now outpace CRC errors often by millions a day which explains page loading sometimes grinding to a halt.
BT have in there infinite wisdom assigned me a snr of 3 which I have to say did work OK previously but along with the increased error rate the snr now swings around 5-6.
Even when I've connected at a slower speed with a higher snr the evening error rate is still often effecting the line.
I still say this coincides with local demolition work, midpoint to my exchange, where phone poles were moved and car parks built.
Anyway would this error rate constitute a line fault?
Here's a couple of router readings. Can't say I believe them all especially the error seconds which sometimes go down drastically as well as up.
Uptime: 30 days, 5:48:01
DSL Type: G.992.5 annex A
Maximum Bandwidth (Up/Down) [kbps/kbps]: 16,127 / 8,240
Bandwidth (Up/Down) [kbps/kbps]: 440 / 7,384
Data Transferred (Sent/Received) [GB/GB]: 1.38 / 25.67
Output Power (Up/Down) [dBm]: 12.5 / 20.0
Line Attenuation (Up/Down) [dB]: 23.0 / 39.0
SN Margin (Up/Down) [dB]: 25.0 / 3.5
Vendor ID (Local/Remote): TMMB / IFTN
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 2 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 519,936 / 0
FEC Errors (Up/Down): 332,145 / NA                      (I assume the numbers got too big here)
CRC Errors (Up/Down): 1,281 / 8,945,879
HEC Errors (Up/Down): 1,368,653,817 / 44,302,793
Never used to get up errors.
From this morning. Had to restart a couple of times as pages were not loading again. Still slower than usual.
Uptime: 0 days, 0:30:54
DSL Type: G.992.5 annex A
Maximum Bandwidth (Up/Down) [kbps/kbps]: 888 / 8,296
Bandwidth (Up/Down) [kbps/kbps]: 440 / 7,672
Data Transferred (Sent/Received) [kB/MB]: 667.00 / 2.67
Output Power (Up/Down) [dBm]: 12.5 / 20.0
Line Attenuation (Up/Down) [dB]: 23.0 / 39.0
SN Margin (Up/Down) [dB]: 26.5 / 3.5
Vendor ID (Local/Remote): TMMB / IFTN
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 17 / 0
FEC Errors (Up/Down): 0 / 8,591,192
CRC Errors (Up/Down): 0 / 53,990
HEC Errors (Up/Down): 0 / 48,871
That's from loading just half a dozen or so pages.
Nothing changed this end. Router still directly connected to first socket (old style no master). Can't hear any noise on the line.

[#2]

Here we are two hours later struggling just to load this page.
Uptime: 0 days, 2:05:50
DSL Type: G.992.5 annex A
Maximum Bandwidth (Up/Down) [kbps/kbps]: 888 / 8,016
Bandwidth (Up/Down) [kbps/kbps]: 440 / 7,672
Data Transferred (Sent/Received) [MB/MB]: 16.55 / 7.43
Output Power (Up/Down) [dBm]: 12.5 / 20.0
Line Attenuation (Up/Down) [dB]: 23.0 / 39.0
SN Margin (Up/Down) [dB]: 26.5 / 2.5
Vendor ID (Local/Remote): TMMB / IFTN
Loss of Framing (Local/Remote): 0 / 0
Loss of Signal (Local/Remote): 0 / 0
Loss of Power (Local/Remote): 0 / 0
Loss of Link (Remote): 0
Error Seconds (Local/Remote): 66 / 0
FEC Errors (Up/Down): 36,032 / 52,428,394
CRC Errors (Up/Down): 1,281 / 357,112
HEC Errors (Up/Down): NA / 2,330,449

As I said the line was fine at this low snr several weeks ago.

[#3]

Looks like disconnections are getting worse, unless you're turning the router off at times:
<img src="http://ccgi.psmith12.plus.com/visradius/generated/image13197238457869.png" />
If the work is still going on I suspect that's it - I daresay there's fairly large electrical fields around some of the equipment when it's in use which would certainly cause errors and disconnections. Not sure it'd be worth raising a fault while that is ongoing to be honest, though I guess if it's scheduled to go on for a lot longer I'm not sure what other options there are.

[#4]

The two areas have been cleared and turned into two car parks. This is just a guess but it must be more than a coincidence as the problem started at the same time.
Drops shown are generally mine today as a few of the connections made have been duds.
The few drops at night are simply because of the increased snr swing which again started at the same time as the increased error problem.
Even on that 30 day up period after 7pm for a few hours was useless every day. Strangely after around 11:30-midnight, even though the snr was still low, the line picked up and was OK???????

[#5]

Hi billnotben,
I would certainly say to raise a fault, otherwise you could wait for that work to finish and find out it has nothing to do with it at all.
Jojo

[#6]

Funnily enough it's 9pm, snr is 1.5, yet pages are loading fast as usual.
I'll see how it goes. Low snr is not normally a problem or BT wouldn't keep dropping me back to 3.
But I guess it could accentuate a problem on a (maybe random) dodgy connection.

[#7]

On that disconnections chart, on six of the eight lines show a disconnection occurring around midnight - do you have an explanation for that ?
For example do you have Economy-7 or night storage heating that switches on at that time ?, or do you have a download server that starts up at that time to make use of your free overnight broadband period ?, or do you have anything on a timer that switches on or off then - like security lighting, or dishwasher, etc ?

[#8]

Those midnight drops are mine. Nothing else like you have suggested.

[#9]

What about the three around 04:00am ? - is that your central heating coming on ?

[#10]

No it's not. The problem is external.
What it is I have no idea. Like I said the snr swing has increased a bit. Drops at the usual time (street lights on) but that must be only part of it now as it actually rises by a few points around midnight. And you noticed the additional dip that sometimes appears around 4am.