Hmm.. I've been running it for a few hours today and I never had any problems. I'll look into it, though.
I suspect it might be an issue with the file being updated by my program midway through you downloading it. Since I'm getting the file at close to 50Mb/s here, it's a lot less likely that conflict will occur for me.
In the end, though, my program is still just a hack cobbled together from old code. I didn't spend much time making it especially robust, so I'd really be suprised if there were no issues.
If I were to invest much more time in this, I'd probably rewrite it as a page generated on the fly, rather than poking my hard drive with an updated file every second or so.