Freezing after a few minutes of screen sharing?

Hello, when setting up a screen sharing session on mountain lion with a lion laptop (the ml is being controlled by the lion laptop), the 10.8 laptop freezes after a few minutes of the session. The mouse cursor still works locally, however no clicking or keyboard input is accepted. The remote controller also loses the connection, and a hard reboot is the only thing to bring the computer back.
Any ideas?
Thanks,
Dan

Yes, that is exactly what I am experiencing.
I followed instructions and found that computer was set to log out after 120 minutes. I don't know if that is the default setting or not, but I know I never set it that way myself, didn't even know the option was there.
I have always had the computer set to start screensaver after 15 minutes, display sleep after 30 minutes, and computer sleep after 1 hour. The computer never logged me out with those settings until a couple of days ago when this problem started. I had changed computer sleep to never so I could see if remote desktop on my ipad would be able to connect to the imac, and that is when the problem started.
I am trying setting screensaver to 10 minutes, display sleep to 15 minutes, and computer sleep to never, and see if that solves the problem. I also unchecked the box to log out after 120 minutes.
Thanks for your help, I appreciate it.
Lewis

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