Imac just turns off. Is anyone else experiencing this?

My computer sometimes goes to sleep and i can never wake it up. It just turns off. Also what is the best way to set the screensaver and energy saver settings? Also is it better to put the computer to sleep or shut down? Looking for some good advice. Thanks.

First go into your system preferences and click energy saver and then click on schedule to make sure it's not scheduled to shut down.  If not then close that window, next click on the restore defaults button.  If you are not going to be using the computer for more than 8 hours I would shut it down, it not put it to sleep.  It's a personal choice on the screen saver issue I personally don't use it, my monitor is set to turn off after 10 minutes. 
Note: if you system keeps on shutting down after all of that then run Apple Hardware Test on your system. 

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