i had att for awhile and always had trouble with it. i swapped multiple modems, got lines check, move the modems around. it never help fix anything at all. i just think its because att servers cant handle the influx of customers they are taking in. my att internet always d/c especially when i use it a lot. they never figured out the problem. same happen to 2 of my other friends
so i moved to cable internet and been happy ever since