HT3964 My computer freezes after running for about 15 min even after setting the energy saving to 3 hours

My Mac computer freezes after running for 15 min even after seeting the energy saving to 3 hours. Any ideas how to stop the freezing/

Hi Teodorafrombc,
Thanks for visiting Apple Support Communities.
If your computer is becoming unresponsive, you may want to see if specific applications are causing this behavior. Try using the Force Quit menu to check for unresponsive applications:
Using the Force Quit feature of OS X makes an application close, even when it is not responsive.
Important: Normally you should not need to force quit an app to close it. When an app is forced to quit, any unsaved changes to open documents are not saved, so try these methods to normally close the app first:
Choose Quit from the app menu. For example, in Safari, choose Safari > Quit Safari.
Choose Quit by right-clicking or control-clicking on an app's icon in the Dock
You can find the article with these steps here:
OS X: How to quit an unresponsive application using Force Quit
http://support.apple.com/kb/ht3411
If your display is going blank or seems to be going to sleep unexpectedly, try these steps first:
Reset the system
You can reset the Mac's parameter RAM and SMC.
You can find the article with these steps and more information here:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
If these steps don't resolve the issue, feel free to reply with more information about the symptoms you are experiencing.
Best,
Jeremy

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