Reza Nauma's video: Ryzen CPU FPS Drops at Nights GTA 5

I have a problem Grand Theft Auto V. At daytime I got 60fps stable framerate (vsync = ON). But when game clock at 7PM (night), FPS sudden drop to 30fps! 😥 This drop is happening when I'm look at the city side. (night only) And during the daytime, the frame rate return to normal again at 70-80fps. (all locations) My spec: • CPU: AMD Ryzen 3 2200G OC'ed @ 3.8GHz • GPU: PowerColor Radeon RX 570 4GB • PSU: Enermax NAXN 500W 80+ Bronze • RAM: TeamElite Plus 8GB DDR4 OC'ed 3200MHz (2x4GB) • SSD: Kingston A400 240GB 2.5 SATA III • Hard Drive: 1TB Western Digital 7200RPM • Motherboard: MSI B450M Pro-VDH • OS: Windows 10 Pro 64-Bit Solutions I've tried; Lowest settings in game Highest settings in game Lowest Resolution to 800x600 (still drop 30fps) Set High priority GTA5.exe Clean install Windows 10 versions (1607,1703,1709,1803) Uninstalling MSI Afterburner & Gaming App Close background programs (Discord, Steam, Origin etc.) GPU Power limit +%50 Reinstalling GPU and RAMs OC RAM frequency at 2666 to 3200mhz Old AMD Drivers Nothing changed!!! Drops still continuing when look at the city! (only at nights)