can you post your hub stats if hh6 then advanced settings then technical log information
if hh5 then troubleshooting then helpdesk
enter your phone number and post results remember delete number http://dslchecker.bt.com/adsl/adslchecker.welcome
can you conenct to test socket with a filter to eliminate any internal wiring problems
have you turned off smart setup?
have you split the 2.4/5ghz networks?
need the dslchecker table posted and also the hh6 stats from technical log information