Did you get the crashing problem resolved, cabo? If your system is still under warranty or has AppleCare coverage you might take it to an Apple Store or authorized service center to have extended diagnostic tests run on it, if that's feasible for you. I've been successful getting a few different hardware issues with both a rev. A and rev. B iMac G5 repaired, sometimes needing to convince Apple there really was a problem. Having a reliable system is certainly worth the persistence and patience to me.
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