Question Why I'm dropping frames/stuttering

Jul 16, 2019
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I'm new to Pc gaming so there's alot I don't know but here's the specs.
Ryzen 5 2600 (not oc)
Rtx 2060 Super (not oc)
Asus b450 motherboard (bios is updated)
ballistix sport 8gb Ram
evga 600 bq, 80+ bronze 600w power supply

I mainly play fortnite and that's where the problem lies, at times it's smooth but will drop from 160 frames to 40 or 70 every 20- 30 seconds . The frames are dropping in calm not high intense situations/ or when the game is loading in. Not to mention I'm playing on the lowest settings.