The auto restart is probably related to the overheating of your phone, so relieving it of some apps eating up so much memory in the background may solve it. In addition to the tips provided in the earlier post, try to turn off your sync and Google updates too in order to lessen the load of your processor.
But if this does not fix the problem, you are already looking at a problem with a component of your hardware.
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If you have problems with your Samsung Galaxy S4, don’t hesitate to email us at firstname.lastname@example.org and we will help find solutions for them. Just be detailed as much as possible so we can easily understand the root of your problem.