Problem with pc freeze

I recently bought a used GPU but in very good condition. but after playing in more demanding games when gpu reaches 100% use, suddenly the pc freezes and the card turns on 100% fan speed but temperature is still ~37/39 C, and I think that this may be a problem with the power supply because it supposedly has the 650 W, but often I had problems with it before. and here's the specification

i5 8400, asus strix gtx 1080, 8GB ram, asrock b360 pro4 and coolermaster gx 650W power supply