PowerBook G4 shuts down with no warning

My PowerBook G4 15" Double Layer is sometimes shutting down completely without warming when running on the battery only. Upon starting the computer clock will be set to 1969 (if “Set data & times automatically” is not on in System Preferences). The problem has been present since about two months ago, with the old recalled battery and as well now with the new one, and has not been related to the battery level. Neither it is related to the fact that the computer is being moved or pressed, or used on an unstable surface, since it may happen even when the keyboard or mouse is not being touched. That is, I could not find any pattern that could help discovering the possible cause. I tried resetting the PMU, with no help.
I found out that a problem of "random sudden shutdowns" has been reported in several threads on the MacBooks. I wonder if the problems are related.
Any hint would be appreciated.
Powerbook 15 High Res 1.67   Mac OS X (10.4.3)  

The most difficult troubleshooting occurs when more than one thing is wrong. That may be what is happening here.
The fact that you need to reset the system clock may imply that the PMU is being reset without your help-this may point to battery issues, or power to the battery.
Do you properly your battery? And will it calibrate?

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