What you are seeing is probably the result of high frequency crosstalk from other circuits. Notice the attenuation stays the same but the margin goes down, in some cases so much the modem/DSLAM downshift to lower speed and even with that the last trace shows horrible margin.
ADSL shares the line with voice. Down load occupies lower part of the band upload uses higher frequencies.
Transceiver Statistics Transceiver Revision A2pB020b3.d20h Vendor ID Code 4D54 Line Mode ADSL_2plus Data Path FAST
Transceiver Information Down Stream Path Up Stream Path DSL Speed (Kbits/Sec) 887 912 Margin (dB) 4.8 12.4 Line Attenuation (dB) 49.0 25.8 Transmit Power (dBm) 14.0 12.6
Them be some bad stats. Generally when you see Margins under 10 your connection will start getting flaky. Seeing as your sync speeds are low and your margins are so low I'm thinking high frequency interference too.
You could try to connect the modem directly to the NID to see if the source is in the house or on the pole.
Also try to get your Datapath changed to Interleaved, Fastpath is quicker latency wise but your lose some error correction which I think you could certainly use atm.
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