[SOLVED] New pc build unstable

Feb 3, 2019
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Hi i recently build my new gaming PC with these following components:
Motherboard: Asus ROG Strix 370 F Gaming
CPU : Amd Ryzen 7 2700x
GPU : Msi Geforce GTX 1660 TI Gaming X
Ram : Corsair Venegence RGB 3000Mhz 16GB
PSU : Corsair Rmx 750W
HDD 1 : Samsung 960 Evo
HDD 2: WD Blue 2TB
The problem i got is the system seems to be runing unstable sometimes the mouse randlomly stoops for few seconds then it comes back to normal , but im sure this is not normal with a new PC also seen some youtube reviews on the graphic card the guy on youtube is getting about 92 fps on GTA 5 with a 2560 x 1440 resolutions while i runing the game on 1920 x 1080 and im only getting about 30fps ? Surely there must be something wrong , what can i do to check the system stabilitiy and possibly solve the problem ?