Question Fps in Warzone almost cuts in half after playing a game or two.

Feb 17, 2021
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I have an i7 8700k,
Rtx 2070
32 Gb of Ram at 2800 MHZ for now
Asus Z390-E
EVGA 850 GA- 800-watt gold rated PSU
When I start playing warzone my fps starts averaging around 100-120 which is fine on mixed normal settings. However, after playing a game or two my fps suddenly drops as if it was cut in half.
I've tried updating my bios, drivers almost everything, even tried messing with my ram frequencies and none of them worked.
I Ran a benchmark on Heaven Benchmark 4.0 and averaged around 150 fps on ultra 1920x1080 which seemed normal.
I also ran Cinebench and my CPU got around 9.1k Points.
At this point I'm not sure what to do and if it's either the game or my pc itself.
Please if anyone can help it would be deeply appreciated.