Question I think My Friends Computer Is stuttering really bad on games. What's the cause?

MXGamer80

Reputable
Apr 23, 2017
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Specs:
Ryzen 7 1700 3.3Ghz
XFX RX580 4GB
WD Black 1TB HDD 7200RPM
8GB DDR4 2400Mhz Single Channel RAM
GIGABYTE AB350M-HD3 AM4 Motherboard
Thermaltake Smart Series 500w 80+ PSU

So about 4 days ago my friend has been experiencing some mad stuttering and low fps. We both noticed that the screen would freeze for half a second, and drop down to 20fps - 40fps, then it would go back to normal which is about 60 - 80fps. There would be lots of stutters in a row for every match in Battlefield 5 (Ultra, 100% Resolution). Even when in DX12, the stuttering seems to still keep happening. But the strange thing is that, before we experienced all of this. We did not have any stuttering, the gameplay was smooth as butter. He says all of his drivers are updated.