s5 verizon restarting itself

i have s5 verizon running stock 5.0 model. today i was using the smartphone as usual and suddenly it restarts. then it keeps restarting itself until i connect the smartphone to the charger . the charging started the phone normally. after the startup of the phone everything was normal. after that i opened the Facebook app on the smartphone. then the smartphone started restarting itself. i even started the phone in safe-mode. the phone started in safe-mode but again starts to restarting itself.

kindly help me. i need to get this smartphone working correctly.

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