Used to do this to me on an iMac. We sold it and got a new one which works like a dream.
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The same thing happened for me.
Details;
Mac OSX 10.5.8
Macbook, 2 Ghz, 4 GB (it's not like it doesn't have enough memory)
Parental controls - on certain websites on the internrt
Error message that restarts Mac.
[scratchblocks]
when gf clicked
repeat until <annoying> = [uncontrollable anger]
say [Restart}
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