I think you've diagnosed the problem yourself - a fault or general deterioration of the wiring/socket in your office has caused the ADSL connection to fail, although replacing the filter is probably the first thing to try.
Alienware 17 R4 2017 review
These brilliant Lego posters show just what children's imaginations are capable of
Mac power user tips and hidden tricks
Comment réinitialiser votre PC, ordinateur portable ou tablette Windows ?