At a guess I would say its the router Andersp, although have you installed ANY new software on the machines lately? Or was the Cable modem drivers updated or anything?
(peida) Kui Sa tahad kedagi tema emakeeles tervitada, vaata meie Mängija Sõnastikku "veel keeltest" lingil lippude all. (pauloaguia) (näita kõiki vihjeid)