What are results from http://www.speedtester.bt.com/ at times Data Rate (Sync Speed) is high and low. Post results in conjunction with the router stats you have been posting before. N.B. You can only run BT speedtester no more than once an hour.
Monitor these regularly and report back.
What exchange?
Speed test
Download speedachieved during the test was - 0.11 Mbps
For your connection, the acceptable range of speeds is 0.05 Mbps-0.25 Mbps.
Additional Information:
Your DSL Connection Rate :0.35 Mbps(DOWN-STREAM), 0.38 Mbps(UP-STREAM)
IP Profile for your line is - 0.14 Mbps
Router stats
Downstream Upstream
SNR Margin:18.0 5.0 db
Line Attenuation:50.0 31.5 db
Data Rate:352 384 kbps
POWER:13.0 12.0 dbm
CRC:22 30
My exchange is Southwell, Nottinghamshire
http://www.samknows.com/broadband/exchange/EMSOUTH