Power PC G5 Freezing/Crashing, then after restart, running great for HOURS.

I have an old PPC G5 Dual 2.5 with 5 Gigs of RAM, and the Delphi Liquid Cooling system, running OSX 10.5.8.
It will ALWAYS freeze within 20 minutes of startup, and have to be hard-shutdown. After it is restarted, it runs GREAT for HOURS. I can mix a 40-channel Pro Tools session forever, and no crashes, nothing. After it's shut down for a few hours, over night, etc., I'll start it up, and FREEZE. THe freeze is usually accompanied by the fans gradually ramping up until they're full speed. I'm surprised it doesn.t start to move.
What the ****? Why the initial freeze followed by incredible stability?
Please, someone help me without telling me to "clean it" or "replace the processors". The thing runs FLAWLESSLY after the initial freeze.
I find this to be incredibly odd. I have a Mac Pro now and am trying to sell this G5, but would like to resolve this freeze problem first.

No idea on Best Buy's prices.
Couple of resets, but I wouldn't do either yet, seems were on to a different problem now...
Does it boot into Open  Firmware with CMD+Option+o+f ?
http://docs.info.apple.com/article.html?artnum=42642
reset-nvram (press Enter)
set-defaults (press Enter)
reset-all (press Enter)
Have you done a PRAM reset, CMD+Option+p+r...
http://docs.info.apple.com/article.html?artnum=2238
But I suspect AT&T may have been refer to a Modem/Router reset.
I also seem to be missing two 256MB sticks of memory sometimes. Could it be Bad RAM?
Could be bad RAM, but with the "sometimes I think it's the Lead-free solder issue.
If you're sure the RAM is good, try the Hair Dryer trick...
http://discussions.apple.com/message.jspa?messageID=13240047#13240047
https://discussions.apple.com/message/15223603#15223603
https://discussions.apple.com/message/15499912#15499912
https://discussions.apple.com/message/15613068#15613068
https://discussions.apple.com/thread/3270112
https://discussions.apple.com/message/16053892#16053892
It can show on any G5, and even many other computers & electronic devices of the period.
http://www.macintouch.com/reliability/pmg5.html
http://lowendmac.com/ppc/power-macintosh-g5.html
And see this last one in particular...
https://discussions.apple.com/message/16781690#16781690

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