I already have and it also restarts on its own. I even got a warning on my phone that it restarted abnormally please send error report to samsung when I opened this app.
Check if your device is heating up, if not check for any malicious app on you device. If you are using Ram Plus that can also cause this problem. This also happened with my device. When i add more than 4GBs of Ram, the phone sometimes restarts automatically. After the latest software update now it is working fine.
