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Help Galaxy S4 keeps on restarting. Confusing situation. Please help.

I have a Galaxy S4 which I purchased about two months ago. It was working fine until last week, when it started restarting automatically. The phone is only showing "Samsung Galaxy S4" written on screen and then it restarts again. When I tried to enter "Safe Mode", this appears on screen,
" Warning!
A custom OS can cause critical problems in your phone and installed applications.
If you want to download a custom OS, press the volume Up key. Otherwise, press the volume Down key to cancel.
Volume Up: Continue
Volume Down: Cancel (restart phone) "
P.S. My phone is not rooted.
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