I have managed to track down my problem. It seems my neighbour across the road is the cause. After much watching times etc i narrowed it down to a property.
They let me into check and kindly allowed me to turn off the electricity supply. My problem went away (monitoring with routerstats) as soon as the supply goes back on my snr slowly decreased from 6 all the way down until i resync. Now we removed the router and telephone from the socket and everything electric was turned off when we turned it back on however the snr continued to climb down. Again we turned off the electric and it shot back up.
Now the telephone cables are all underground.
What im trying to find out is why this propertys actual mains supply is causing my adsl to degrade constantly? Is there something that needs to be checked? This has not always been the case and only started in September last year. No work has been done here to the electric or bt lines underground.
Does anyone have any ideas?
Edited by Lemzip (Thu 03-Feb-11 18:07:07)