I don't know if it's because I use pan on Linux, or something up with GigaNews, but every now and then when I'm in the middle of downloading large files, my connection will die. Only way I've figured out how to get my connection back is to kill and restart pan.
That aside, if you like to browse newsgroups, 1 GB a month goes rather quickly. I've been known to use it all in a day or two.