I Buy MSI Gaming laptop... The Problem is 30 Minutes Auto Shutdown...

I Buy My Second Hand MSI Laptop GL62M Model.... I Buy This Laptop 2 Months Ago... Problem is 30 Minutes Shutdown Fix Time... I many Times Solved This Problem...3 Times Window Change...But Not Problem Solve... 4 Times Goes on Servie Centre But Technician says Change The Motherboard Which will be Very Costly...i am Very frustrated ... please solve this problem...any one guys...

Thanks in Advance....