For ADSL your speed should be a function of your socket distance from the 'cabinet' - so you can check that via a web-site (broadbandchoices etc) by giving your post-code, if you do that it will confirm whether you would expect 11-12 or 7-9mbs.
(When you said 'your router' is having a problem, I assume you mean the modem/adsl part of the Hub, and also that you are seeing problem when you have a wired connection to hub, so ruling out any wireless problem )