G4 going into sleep mode every 30 seconds

hello all-
I have been having a really nagging problem which I think may be owing to the recent 10.4.10 upgrade (since the problem didn't occur before then). Maybe someone else knows if the OS upgrade is the offender here, or something else.
Anyway- after about an hour to 90 minutes of use, my G4 PowerBook goes into sleep mode unannounced. It can be brought back out of sleep by holding down the power button, but it will go right back to sleep again within a minute's time, and will continue doing this indefinitely (as I discovered when trying to bail out all my recent documents, just in case.)
-I've tried starting the system in safe mode to get rid of unnecessary caches etc., which didn't do the trick.
-I've tried using the system while running on battery power and when connected to a charger.
-I also looked at similar problems on this forum, regarding the 'disk sleep timer' .plist. I can't find this exact file under /Library/Preferences/SystemConfig/com.apple.PowerManagement.plist, so perhaps that has something to do with it?
-I also made sure the display and computer settings were set to the maximum 'never turn off' level.
So! Any ideas? Is this a problem exclusive to 10.4.10? Thanks in advance.

Ok, I've followed your advice, gone into the system log, and I think I've isolated the problem (judging from the times that the message was received) to the following:
Jul 30 12:17:55 MyHD kernel[0]: Power Management received
emergency overtemp signal. Going to sleep.
I'm baffled why it would be receiving an overheated signal- the computer is in a cool environment, and on all occasions when it went into these sudden sleeps, it was running a bare minimum of applications. No external hard drives, printers, or anything else connected, either.
Anyway, looks like at least the probem has been identified. This would explain why the problem only occurs after the computer has been in use for an hour or two.

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