Low SNR early signs of a fault?

[#1]

DLM dropped my connection twice last night, second time SNR dropped from 6 too 3.  When that happened on my old DSL connection it was always a phone line fault was the cause, but not sure if its true for fibre or if my connection is just that good.  Using a Billion 8800NL so hopefully its able to hold the connection on 3 SNR

edit: forgot to say already done a couple of quiet line tests over 15mins trying to catch any hissing but none

	Downstream	Upstream
Line Coding (Trellis)	On	On
SNR Margin (dB)	2.8	4.8
Attenuation (dB)	20.6	0.0
Output Power (dBm)	13.0	6.6
Attainable Rate (Kbps)	63352	18838
Rate (Kbps)	74380	20000
B (# of bytes in Mux Data Frame)	239	236
M (# of Mux Data Frames in an RS codeword)	1	1
T (# of Mux Data Frames in an OH sub-frame)	22	5
R (# of redundancy bytes in the RS codeword)	0	16
S (# of data symbols over which the RS code word spans)	0.1027	0.3771
L (# of bits transmitted in each data symbol)	18696	5410
D (interleaver depth)	1	1
I (interleaver block size in bytes)	240	255
N (RS codeword size)	240	255
Delay (msec)	0	0
INP (DMT symbol)	0.00	0.00
OH Frames	0	0
OH Frame Errors	113567	2438
RS Words	0	1858287
RS Correctable Errors	0	20
RS Uncorrectable Errors	0	0
HEC Errors	390541	0
OCD Errors	12	0
LCD Errors	12	0
Total Cells	777843408	0
Data Cells	5488962	0
Bit Errors	0	0
Total ES	48762	2310
Total SES	87	6
Total UAS	160	231239

[#2]

Your connection may have dropped and re-synced at a target noise margin of 3dB instead of 6. This would be an indication that DLM sees your connection as stable and able to cope with a lower target SNR margin, thus giving you an increased line speed.

[#3]

Nothing to be concerned about unless you do start to have issues, @maranello is accurate in their response.

[#4]

Considering that the attainable rate figure is much lower than the current line rate, it looks like the 2.8 dB current SNRM is lower than whatever the target SNRM was, so it probably connected when there was less noise present.

[#5]

This used to be the norm that if your line managed a long uptime it automatically changed from 6 to 3.

But I assume this has more to do with BT's rumoured experiment of dropping everyone to 3 if their line stands a chance of maintaining it.