Hello Jason,,
Thanks for the response. Your suggestion is not my problem. It does not matter how long I set the machine to sleep. My machine powers down after some period, but ONLY when I am playing iTunes. I am also running Parallels 9.0 which uses Windows 7 at the same time Mavericks is running. This allows me to use my Windows programs. If I shut down Parallels, it does not solve my problem. Also, it is important to note that when playing iTunes, the machine suspends Windows 7 completely and powers down the Mac to the sign-on screen. Sometimes the machine powers down after 10 minutes and sometimes 20 minutes or a little more. I am really stumped!! This situation never happens unless I am playing iTunes. Otherwise the sleep routine functions normally.
Sherry