Warzone Warzone running poorly on my PC

[Sanskio]

I'm trying to get Warzone to run smoothly on my PC but it runs max 70 FPS and dips down between 15-30 FPS during combat, even on low settings.
Does anyone know some ways to fix this?
The game would run flawlessly for me when it was first released, maintaining between 70-100 FPS.

Here are my specs
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CPU

Intel Core i7 4770 @ 3.40GHz
Haswell 22nm Technology

RAM

16.0GB Dual-Channel DDR3 @ 798MHz (10-10-10-27)

Motherboard

HP 2B36

Graphics

4095MB NVIDIA GeForce GTX 1070 (Gigabyte)

Storage

1863GB Seagate ST2000DM001-1CH164 (SATA)

953GB ADATA SE800 SCSI Disk Device (USB (SSD) - Warzone is installed here.

Thanks,