When your downloads stop, do other programs stop working too? such as your web browser, MSN, or WPN connection? If that's the case, it's something making your entire internet connection drop, and not only WinMX. I don't know what could be causing that, maybe a poor physical connection to your ISP. If it's only your WinMX transfers, then it can be what valor said about your ISP monitoring your connections and activities. If that's the case, I suggest you change provider, as it isn't your provider's business what you use your internet connection for, what e-mails you send and receive, and what websites you visit.