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Help Samsung galaxy j5 2017 reset itself

Hi i have a samsung galaxy j5 2017 and i left it for a few hours in my pocket and when i went back it is on the start up screen askin for email and password. When i logged onto recently used devices it said my device was last sycned at 8.40 in the morning so if i was on my device after that time it would of synced but it didnt how can a device reset itself
 
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