ITunes causes my Mac to restart

Hi:
Any help on this would definitely be appreciated. I am running iTunes and playing a group of songs. After some variable length of time (at least 30 min but it varies and can go for as long as a few hours), my Mac just powers down. When I restart it, everything seems fine - I verify and fix my drive using Disk Utility (normally catches one or two misassigned file ownerships) but the problem happens again if I am playing iTunes for an extended period of time. This is not a big deal but it is an irritant.
Thanks.

Hi Dana:
I have not installed any iTunes plug-ins to the best of my knowledge. I checked my Energy Saver settings and they are at the same settings that I have had for years (the tick just below 15 min for both sliders). iTunes is v7.1 and QuickTime player is v7.1.5. I also had erroneously left the OS version from my last post - I am actually running 10.4.8. Hopefully this helps.
Thanks,
Barrie

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