Unknown DirectX Error

Hello, Since a month I'm having some in-game problems. Sometimes when I'm playing League of Legends my screen suddenly freezes and I'm not able to play anymore. After that there comes a pop-up saying that there is an 'unknown DirectX error'. I have done some research on the internet regarding this issue and most of the times people say to downgrade the graphic card drivers. Since I'm not an expert on these things, I have no clue how to. So my question is if someone here can help me. I'm usually running LOL whit the GeForce Experience program. All my drivers are up to date btw. I have a GeForce GTX 960M Nvidia Installed on my windows PC. Please Help! Thanks in Advance.
Report as:
Offensive Spam Harassment Incorrect Board