Powerbook G4 Aluminium 1,67 GHz keeps sleeping when fully charged

Hi!
Just got a Powerbook from a friend of mine for no small price, and am feeling as if I made a HUGE mistake.
It worked perfect for 3 weeks and suddenly since yesterday, once the battery is fully charged and the indicator lamp turns green, the Powerbook would suddenly go to sleep. I wake it up again only to make it go back to sleep. It works fine when I remove the power cable and run it on battery, or when the Powerbook is charging.
I tried looking in the system log but the dreaded Trackpad line "Power Management received emergency overtemp signal. Going to sleep", is nowhere to be found, instead I have a line like "kernel[0]: hibernate image path: /var/vm/sleepimage" and it goes to sleep immediately after. Nothing precedes this line.
I am stymied, some say it is a logic board problem. My PB has 2 year warranty from the store I bought it from, I can take it back, but the loss in production time would be a lot : ( Any help?
PB G4 SD, HD 1,67 Mac OS X (10.4.9)

Hey Dave,
Thanks for your input. I did install "Temperature Monitor" after reading your responses on other forum threads. There are no untoward spikes, though as the day progresses and I open more documents or do CPU intensive tasks, the temperature naturally spikes. I have had up to 62°C (143F) CPU temperatures and 45°C (113F) HDD and Trackpad temperatures. These I thought were under the temp specs mentioned in the program.
As I work in a huge greenhouse affected room , with the summer coming up, the temperatures in the room go up to 85F, and the PB keeps sleeping ever more often. Well it is back to AppleCare with this. Disappointed though.

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Powerbook G4 Aluminium 1,67 GHz keeps sleeping when fully charged

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