PPC G4 double 1.25 shuts down on me (Leopard recent)

It's becoming more and more problematic. Sometimes it did it in sleep mode after days of being asleep. Now it does it in sleep mode and in work mode, totally unexpected and not related to any specific operation or program.
After restarting it brings the wrong time report but resets itself to the right time soon using the internet.
I have two internal HDs and one external connected.
Any idea ?
Thanks
bafomet

After restarting it brings the wrong time report but resets itself to the right time soon using the internet.
That suggests the PRAM battery is dead. A dead PRAM battery can create startup trouble but is probably not the cause of the shutdowns that you've experienced. Still, it;s a good idea to install a fresh battery to avoid its masking another problem.
Shutdowns during use are most commonly due to the computer overheating. Nearly all Macs have thermal protection circuitry that senses dangerous temps and shuts down the computer before the temps reach the fatal zone. Dual processor G4s seem especially prone to running hot.
Download this free DashBoard widget:
http://www.apple.com/downloads/dashboard/status/istatpro.html
It will report processor temps. If you post the temps you get as you use the computer, then we can offer some suggestions..

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