Wireless Connection dropping out

Hi, my story is longwinded so Ill try and keep it short. Have two laptops one
Dell Inspiron 6400 and an older HP. Connected to network via BT Voyager 210
and Belkin wireless access point. Router and Belkin box worked fine until
last week when two things happened.
1) BT upgrade to up to 8mb broadband. This had complications as upgrade
found faults on our tel extension wiring which was causing our DSL light to
be unstable.

2) To overcome this the master box was moved upstairs in our house with the
digital line coming in to the router and the tel lines diverting round the
house in analogue. We now have a solid DSL connection at the faster speed but
the wireless connection is dropping out.

Happening on both laptops, so I know its not them. DSL light is steady and I
can connect via ethernet so I know internet connection is ok.

Im therefore assuming its either the Belkin box or where it is now located.
As this is the location of the digital line, the box cannot be moved
elsewhere.

Any ideas??