My MAC AIR Keeps trying to log out

Friends, for the past two weeks, my computer continually tries to log out when I am downloading TV shows on ITUNES. The attached screen shot shows the error messages I get. Sometimes when I click on the DON'T QUIT, the box goes away, other times, I get an error tone and the box does not go away. I at that point have to quit ITUNES via FORCE QUIT and then restart ITUNES. It appears that ITUNES continues to download, and does not lose all the content downloaded to that point. Can someone help?

By way, if this is the wrong place to post this, I apologize in advance. If you could let me know of a better place, I would go there.

Verify your System Preferences - Energy Saver settings - it's probably trying to go to sleep due to inactivity.

bobtomay said:

Verify your System Preferences - Energy Saver settings - it's probably trying to go to sleep due to inactivity.

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I checked -- by battery settings do call for a log out after 15 minutes, but I get these messages when hooked up to my power adapter and those settings include "never" for computer sleep.

Are you sure you are not pressing shift-command-q, the keyboard command that will try to log you out?