Since i switched from Smartbro(sucks big time) --> MyPLDT DSL plan 999, malaki ang improvement sa speed at connections. We experienced the same problem as yours w/ PLDT DSL during installation. Pati phone dial tone namin ay nawala. But they found out that yung cable lang pala ng existing telephone line namin ay corroded na dahil sa kalumaan. PLDT lineman came next day and laid a new cable. Since then hindi na kami nagka-problema or downtime.