Sometimes my Obi110 (actually every x days) causes very high noise margin (which causes low broadband speed (i.e. from 36Mbps -> 12Mbps), only solution is to disconnect Obi110 and then router after reset won't show high noise margin (resetting with connected Obi is not working and keeps showing high noise margin).
I am using normal RJ11 (UK) and some broadband filter connected to the another broadband filter...