Bandwidth shortage?

[JRV]

During peak hours (more than 50 or 60 listeners) the 128k stream drops frequently, as often as every ~15 seconds as I write this, which makes it pretty much unusable. Don't have this problem with the 56k connection, so that's a workaround, but I'd rather have the 128k work!

Using Winamp3 on ADSL 768/128. Per DSL Reports my line tests consistently at ~630/103, even at peak times, so unless I'm the only person with this problem, I don't think the problem is on my end. I'm the only user on this DSL connection.