Server "Freezes" at least once a day

Hello
I have a Xserve G5 with OS X 10.4.9
I run a Forum with vBulletin (Mysql).
My problem is that almost every day, the server freezes, if i do ping, it works, but nothing else. No ARD, No server Admin, no SSH, NOTHING... Sometimes it came back... and i can retake control. Sometimes it just don´t come back and i have to restart it manually...
I have reinstalled OSX, reinstalled Mysql, everything... and the problem continues... The funny thing is that i´m runing the forum with OS X server for more than 2 years. I used to have a Mac mini G4 with no problems... i upgraded to the xserve, and the problem started...
The site is www.twistedandes.com
Any idea what can be?
Thanks
Mariano Lozano

Hello Steve
Thanks for your help. I´m not an expert, but as i can see, today the server have freezed again for about 30 minutes and when it ocurred, the log shows severall times this error:
Jun 11 08:58:44 Twisted postfix/sendmail[7172]: warning: fork: Resource temporarily unavailable
If you want i can send you the complete log.
Thanks
Mariano

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