Random reboots topic

Im about to buy a s5 att. And my friend told me that the s5 has random reboots every 20 minutes or every hour. Sometimes they can be every 4hrs. We dont know exactly what can be. We are in mexico so theres no garanty. We need to go to the states and thats 14hrs away from here. the s5 isnt rooted or ever flashed. I wonder if i do root and clean flash a new rom could that issue be solved? Or need new s5

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