Line Attenuation Problem

does line attenuation change possible when the distance of you from exchange is same.

about 4 months ago my line attenuation was 36 but about a month ago it changed to 42 thats why my Noise margin dropped from 30+ to 20-23. which causes me problem of disconnection when i receive a call.

please tell me is it possible of line attenuation change by its own from 36 to 42

How to solve this problem..

todays ADSL line status

Current adsl line status is as the below.

Line Mode G.DMT Line State Show Time

Line Up Time Duration 00:00:02:43 System Up Time 00:00:50:05

Line Downstream Rate 2048 Line Upstream Rate 512

Latency Type Interleave Line Coding Trellis On

Noise Margin 21.5 Line Attenuation 42.0

Output power 12.1 Attainable Line Rate 5472

Line Up Count 6 Status No Defect

about 4 months ago ADSL line status

Line Mode G.DMT Line State Show Time

Line Up Time Duration 00:03:33:13 System Up Time 00:03:33:36

Line Downstream Rate 2048 Line Upstream Rate 512

Latency Type Fast Line Coding Trellis On

Noise Margin 29.9 Line Attenuation 36.0

Output power 12.3 Attainable Line Rate 8608

Line Up Count 1 Status No Defect