CS:GO mouse problem.

Hello boys, im completely lost and i need your help. I have problems with my mouse. Its not like everytime, but it happens quite often and i lose duels coz of that. It happens sometimes but when i start with my spray, i shoot like 2-3 bullets and my spray stops like if i stop pressing left mouse button. I tried my second mouse, but its still happening, so i thought its problem with my PC, but nah. Ive been on LAN and it was happening also on other PC, so im out of ideas where could be problem. Thanks for every advice !