What he said - try router in master socket.
If that works best layout is to plug one ADSL filter into the master socket. Plug the router into the network port on the filter. Plug any phone extension (s) into phone socket on the filter.
I don't know the Solwise but google says the line status page is accessed as follows..
Quote:There is a page within the router GUI that displays the line stats. Click the link below.
http://192.168.7.1Click on WAN, then choose DSL and finally DSL Param
Should give you info on the line quality (S/N ratio, Attenuation etc.) Explanation of what the numbers all mean here..
http://www.kitz.co.uk/adsl/linestats.htmAlso forum here might help..
http://www.solwiseforum.co.ukCould be faulty router. I think that model is quite old? Was your adsl speed increased 7 weeks ago? What might have changed in the house 7 weeks ago? New washing machine? Sky box? Heating on?