I can tell you 100 percent, beyond a SHADOW of a doubt, IT HAS NOTHING TO DO WITH THE ISP!!!!!

I use an AT&T DSL line at home, a 20MB Metro-ethernet connection at work (that I'm the Network Admin and manage the firewall on), I've tried it on Charter Cable internet at a friends house, and I've been able to replicate it on my Fiance's Brighthouse Cable internet connection.

The problem ONLY HAPPENS when you push the bandwidth limit in JDdownloader down. The problem IS IN JDdownloader and how it allocates the bandwidth.

I can do this. I can even replicate the problem while watching a streaming movie on netflix that NEVER hiccups. So, no, the INTERNET connection never gets interrupted.