Galaxy S4 constantly restarting

I'm not sure what's going on here, but my S4 started to constantly reboot and I can't figure out why. It happens at least once every hour or so. I did just update to 4.3 not that long ago, but I don't think the update is related to the restarted. I tried uninstalling some recently installed apps and that did not help. I can't find a pattern

Has anyone else experienced this?

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Does the back of the phone feel hot? Specifically the battery? Some have reported faulty batteries that are, in some cases, bulging. Samsung will replace them under warranty, but it might take a while to get one.

Try turning off the phone, taking the battery out, plugging it in, and restarting the phone without the battery in it. See if it reboots under these conditions. If it doesn't the problem is more than likely the battery.

If it still restarts than it is software related. First thing to test is the sd card. Take it out and see if the problem persists.