ADSL dropping every 30 minutes?

[#1]

Yep, but only using it to get a cursory glance at what's going on. I'll post logs and graphs later

[#2]

Well, here's some of the logging before I go off to bed.
adsl info --stats
adsl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    8000
Last initialization procedure status:  0
Max:    Upstream rate = 1260 Kbps, Downstream rate = 12988 Kbps
Bearer: 0, Upstream rate = 1255 Kbps, Downstream rate = 12923 Kbps
Link Power State:      L0
Mode:                  ADSL2+
TPS-TC:                ATM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        9.0            5.6
Attn(dB):        23.0            12.3
Pwr(dBm):        0.0            12.7
                        ADSL2 framing
                        Bearer 0
MSGc:          51              12
B:              230            38
M:              1              1
T:              2              4
R:              0              0
S:              0.5707          0.9873
L:              3238            316
😧              1              1
                        Counters
                        Bearer 0
SF:            2513821        413356
SFErr:          68              62
RS:            0              2475457
RSCorr:        0              0
RSUnCorr:      0              0
                        Bearer 0
HEC:            195            50
OCD:            5              0
LCD:            5              0
Total Cells:    1246333217              120888476
Data Cells:    65405131                5423673
Drop Cells:    0
Bit Errors:    8362            3791
ES:            311            272
SES:            21              0
UAS:            161            161
AS:            40900
                        Bearer 0
INP:            0.00            0.00
INPRein:        0.00            0.00
delay:          0              0
PER:            16.26          17.77
OR:            28.03          8.10
AgR:            12901.60        1259.08
Bitswap:        288/288        17/17
Total time = 1 days 3 hours 17 min 4 sec
FEC:            0              0
CRC:            1311            476
ES:            311            272
SES:            21              0
UAS:            161            161
LOS:            2              0
LOF:            18              0
LOM:            0              0
Latest 15 minutes time = 2 min 4 sec
FEC:            0              0
CRC:            1              0
ES:            1              0
SES:            0              0
UAS:            0              0
LOS:            0              0
LOF:            0              0
LOM:            0              0
Previous 15 minutes time = 15 min 0 sec
FEC:            0              0
CRC:            0              0
ES:            0              0
SES:            0              0
UAS:            0              0
LOS:            0              0
LOF:            0              0
LOM:            0              0
Latest 1 day time = 3 hours 17 min 4 sec
FEC:            0              0
CRC:            23              0
ES:            21              0
SES:            0              0
UAS:            0              0
LOS:            0              0
LOF:            0              0
LOM:            0              0
Previous 1 day time = 24 hours 0 sec
FEC:            0              0
CRC:            1121            249
ES:            148            141
SES:            21              0
UAS:            107            107
LOS:            2              0
LOF:            18              0
LOM:            0              0
Since Link time = 11 hours 21 min 39 sec
FEC:            0              0
CRC:            68              62
ES:            61              38
SES:            0              0
UAS:            0              0
LOS:            0              0
LOF:            0              0
LOM:            0              0
>
Attenuation
02 Apr 2016 00:47:21 23.0 12.3

[#3]

And third post in a row...

[#4]

Again, as I've said a few times, your connection is inherently good if it weren't for this occasional "event" that's causing a burst of errors and sync to be dropped and all that data seems to confirm that.
With regard to the graphs, if you can adjust the bit scaling to cover all 512 tones, but IIRC there can be a bit of a compromise because the scale is either too much (so plots are a bit squashed up) or too little (as you have) - it's a long while since I used DSLstats and I don't use it as it fills the 582n log up with constant login/logout messages and so other important information is lost from the log (unlike RouterStats which works with the 582n).
If you can change the graphing of the ES errors to be real time, that could help. Other than that, I don't know if you can identify when that burst of ES errors occurred.

[#5]

You're absolutely right. Aside from this weird intermittent issue the connection is rock solid, stable and the speed is as good as it'll get without going to FTTC.
I'll attach the new graphs - I've got one with up to 375 so the scale is still reasonable, but the next one is up to 750 which is a bit too much 😕
For the error seconds, should I leave it to log with the sample time set to 1 second or something?

[#6]

Sampling every 10 seconds is generally quite adequate. Even if the ES occur between samples the count will still increase.
It wasn't the sampling frequency so much that I was talking about rather than the x-axis scale and the plotting. If that could be real time rather than "Hour".
As far as Bit plotting goes, I think the 750 scale will do for now. ADSL2+ goes to tone 511. And upto ~tone 440 everything looks pretty good and what might be expected, but then the sharper drop-off to ~tone 500 and the small peak after that is somewhat unusual.
Haven't got any Radio Amateurs living near you by any chance?

[#7]

Unfortunately, all I can see on dslstats is ES per hour with no real time option or stat. The only ones that can be monitored and logged real time are CRC, FEC and SES
As for radio amateurs nearby, I honestly have no idea!
No more LOF or LOS errors so far today, and the link hasn't dropped either. Maybe whatever was going on was just a chance issue...
DSLAM/MSAN type:        IFTN:0x71c8 / v0x71c8
Modem/router firmware:  AnnexA version - A2pv6F039i.d24e
DSL mode:              ADSL2+
Status:                Showtime
Uptime:                1 day 6 hours 36 min 13 sec
Resyncs:                0 (since 02 Apr 2016 20:02:02)

Downstream Upstream
Line attenuation (dB):  23.0 12.3
Signal attenuation (dB): 25.2 12.6
Connection speed (kbps): 12923 1255
SNR margin (dB):        9.1 6.1
Power (dBm):            0.0 12.7
Interleave depth:      1 1
INP:                    0 0
G.INP:                  Not enabled Not enabled
RSCorr/RS (%):          N/A 0.0000
RSUnCorr/RS (%):        N/A 0.0000
ES/hour:                6.71 1.87
Status: Showtime
Last Retrain Reason:    8000
Last initialization procedure status:  0
Max:    Upstream rate = 1260 Kbps, Downstream rate = 13032 Kbps
Bearer: 0, Upstream rate = 1255 Kbps, Downstream rate = 12923 Kbps
Link Power State:      L0
Mode:                  ADSL2+
TPS-TC:                ATM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        9.1            5.8
Attn(dB):        23.0            12.3
Pwr(dBm):        0.0            12.7
                        ADSL2 framing
                        Bearer 0
MSGc:          51              12
B:              230            38
M:              1              1
T:              2              4
R:              0              0
S:              0.5707          0.9873
L:              3238            316
😧              1              1
                        Counters
                        Bearer 0
SF:            6773454        536863
SFErr:          223            140
RS:            0              4051150
RSCorr:        0              0
RSUnCorr:      0              0
                        Bearer 0
HEC:            555            151
OCD:            9              0
LCD:            9              0
Total Cells:    3358225859              325781300
Data Cells:    224432013              16678169
Drop Cells:    0
Bit Errors:    21943          9060
ES:            439            313
SES:            21              0
UAS:            161            161
AS:            110205
                        Bearer 0
INP:            0.00            0.00
INPRein:        0.00            0.00
delay:          0              0
PER:            16.26          17.77
OR:            28.03          8.10
AgR:            12901.60        1259.08
Bitswap:        438/438        30/30
Total time = 1 days 22 hours 32 min 9 sec
FEC:            0              0
CRC:            1466            554
ES:            439            313
SES:            21              0
UAS:            161            161
LOS:            2              0
LOF:            18              0
LOM:            0              0
Latest 15 minutes time = 2 min 9 sec
FEC:            0              0
CRC:            0              0
ES:            0              0
SES:            0              0
UAS:            0              0
LOS:            0              0
LOF:            0              0
LOM:            0              0
Previous 15 minutes time = 15 min 0 sec
FEC:            0              0
CRC:            5              0
ES:            5              0
SES:            0              0
UAS:            0              0
LOS:            0              0
LOF:            0              0
LOM:            0              0
Latest 1 day time = 22 hours 32 min 9 sec
FEC:            0              0
CRC:            178            78
ES:            149            41
SES:            0              0
UAS:            0              0
LOS:            0              0
LOF:            0              0
LOM:            0              0
Previous 1 day time = 24 hours 0 sec
FEC:            0              0
CRC:            1121            249
ES:            148            141
SES:            21              0
UAS:            107            107
LOS:            2              0
LOF:            18              0
LOM:            0              0
Since Link time = 1 days 6 hours 36 min 43 sec
FEC:            0              0
CRC:            223            140
ES:            189            79
SES:            0              0
UAS:            0              0
LOS:            0              0
LOF:            0              0
LOM:            0              0
>

[#8]

I had a vague feeling certain error monitoring had limited options, it's not too important, as whatever is gong on will result in bursts of CRCs and if the line drops there should be some SESs. The ES count will change anyway so that will be in the stats. You won't get any FECs plotted whilst Interleaving is off.
As far as Radio Amateurs go, you'd notice some very large aerials, some much bigger than the old 405 lines TV aerials and FM aerials, also some "Long Wire" aerials which would be needed for "Top Band" which is an amateur band operating 1.8-2.0Mhz which covers some of those tones around 430-480. Just trying to think of possible explanations for that unusual bit loading. It could of course be due to some other electronic equipment which might generate those sort of frequencies.

[#9]

Well, ran a route around my estate this morning and didn't see anything that would indicate the presence of radio amateurs. Still no drops or more LOF and LOS though, which is a good thing!
Definitely could be other electronics, the modem is in the study with a heap of other gear. I'll try and get rid of whatever I can nearby and try logging then

[#10]

The trick is to make sure any "suspect" kit (or stuff just not needed to be on) is powered off at the mains, ie. not just in standby. If you see an event occur even if it's some time after, you'll see the time on the graphs. Have a think about what might have been going on, switched on/off etc at the time. If you were in, did you notice anything with the power - eg. lights flicker etc. Tracking this sort of thing down is never easy.
If you go a lengthy period now without anything happening, start switching on the stuff that's normally left on, only one at a time, leave it on for a good period and see if anything happens.