Having Beetal four light modem. When the modem is switched on, the red light and the last green light glow but the yellow light goes on blinking at least for five minutes, sometimes for more than 10 minutes and thereby I am loosing internet time. Sometimes during browsing, the yellow light goes out and starts blinking. Number of time complaint were given and attended but there is no permanent solution. Lot of changes have been made in the installations, but no use.