Clock randomly jumps forward, sometimes as much as 24hrs

I've got a problem with my Powerbook G4 where at random intervals the clock will just reset itself, leaping forward by some unpredictable amount of hours and/or minutes - sometimes it's even days ahead.
I've looked through the forums here and not been able to find any references to this specific problem - am I the only one who's got/had it? :/
I can go into the date/time preferences and reset it there, but I shouldn't have to be doing that every other day.
Also, the 'automatically update/synch' option keeps deselecting itself.
It's starting to get really annoying - the number of times I've had to edit something because the time it's showing (taken from the computer's clock) is totally wrong!
Has anyone got any idea what the problem is and if/how it can be fixed?...
PowerBook G4   Mac OS X (10.4.7)  
PowerBook G4   Mac OS X (10.4.7)  

One year, 3 months.
It reset when I disconnected, removed the battery and held down the power button, as suggested by Apple when the clock loses time...but then that's what it's meant to do, right?
This machine cost me £3000, and isn't even 18 months old yet! Now not only do I have this problem, but the display is crapping out on me too. I'm not exactly impressed.

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