HELP att dsl please help

i have sbc dsl 763kb modem speedstream 5100 connected directly to the computer......residential

my modem has 5 lights power ethernet dsl internet activity....
the first 4 light are on solid...activity just blink

when i try to stream a video (like on youtube) or download it would work fine at the beginning then stop.I can see the buffering but it just stop dling at some point. When it stop i try to open a different browser but it wont load...internet has stopped but the lights are fine.....activity light also stop blinking......it would stay like this for awhile and then the activity light start blinking again and i have connection again....

i'm only able to use the internet for 1 or 2min and then it would stop / pause.....

i have tried on 2 different computer and both same thing. I've used this speed at my business before and it was fine. I've also had dsl on this line before and it was fine.Definitely not the computer, speed, or line. Help me !

i've also called them..they were of no help...gave me a ticket number so line tech check line it was fine and closed the ticket >.>