Desktop keeps freezing

Hi guys ive got the same computer and the same problem keeps freezing
after the motherboard had gone it was sent back to be replaced since having it back it freezes ive recorded thye freezing and has been sent back but they came back with nothing wrong and as time goes bye its getting worse ive installed a new hdd (ssd) ive removed and checked ram ive ive cleaned the cpu and new paste but still nothing seems like a fault somewhere but were
 
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