Internet cuts out

How’s it going? I’ve got a problem concerning my internet connection cutting in and out. It only happens on the desktop on my home network. My laptop and Xbox are not effected what so ever. Comodo and my router show what I’d think a pretty huge amount of outbound connections from Firefox (about 30 to 50, sometimes 70), and once it gets up to about 50, my internet cuts out, and something I noticed or missed about Comodo Version 3 is that you cannot stop individual IP addresses linked to that connection. Help would be nice, as it cuts out quite frequently, about once every minute, from ten seconds to sometimes half a minute, and I am running Windows XP SP 2./