Why My Phone Has "Epileptic Seizures" ?

[AC Question]

From Time To Time My Phone (Nokia 3 Android) Have Some "Epileptic Seizures" ... Vibrating and Goes "Back Back Back Back" ... And I have to Push the Start Button, Enough Times for to make "It" Stop "All That"... What Can I Do To Avoid "That" ?

 

[Rukbat]

Either the motherboard is defective or water got into the phone somehow (going from a hot humid outdoors into a cool air-conditioned place can cause condensation inside the phone, which is the same as putting it into water).