Intermittent error 500

[Usagi]

I am running a torrent tracker from my PC.
My system is:

Windows XP SR2
Apache 2.0.55
mySQL 5.0
PHP 5.1.2
Active Perl 5.6.1

What I find very strange is that this is intermittent. Sometimes I get the page and other times I get error 500 Internal Server Error.

In my Apache error log I see:
[Fri May 05 22:37:09 2006] [warn] (OS 64)The specified network name is no longer available. : winnt_accept: Asynchronous

I have a suspicion it has something to do with the number of people on the torrent and that I somehow need to get XP to accept more connections.

I upped mySQL's max connections from 100 to 500 but I don't think that's it because I should get a mySQL, "Too many connections" error.

How can this be fixed?

Thanks in advance