I just subcribed to streamyx 2 weeks ago & I have tried changing the setting in the web admin page but I'm still having problem with my line.....

I'm getting contants disconnection whereby the ADSL light would go off & back,
off & back...sometime I can surf for about 40 mins or so....but it would
disconnect after that.
when I login to the web admin page of the modem...the speed is sometime
512..480...420 and even 384kbps...
when I telnet the modem, sometime it would show line up for a few second and than line down for a few second...it keeps on going like that....
when I look at the DSL statistic in the web admin, I get like 150+ error seconds in like 10 minutes & 300+ in CRC...
Appreciate if someone out there can help!