you don't have to restart anything just press " Win + Ctrl + Shift + B " ( it's the shortcut to refresh the graphics card you can do this whenever your app is not responding or like that )
This happened to me many times on other games once (I mean it only happened once in the game every time it does that, in fullscreen games it just spins my camera really fast which sometimes cost me) & sometimes outside of games which is where I see where the cursor went when it happens. Windows 10 always have something I hate. At least the auto restart after update doesn't restart you until you clicked "Restart now" anymore If anyone asked, I found this video through Google & I thought it's a general fix
Ctrl+alt+del, after this open task manager and click end program if still happening just shut down ur computer by clicking the shut down button at the right bottom corner after clicking Ctrl+alt+del
There are two ways to prevent this problem... 1) To be attentive during launching the riot client and loading of the game and moving the mouse when the screen turns black 2) If for some reason your mouse gets stuck just press Alt + F4, it will exit the game and u can launch it again and then use step 1
@@scoupslivegaming5906 thanks bro i was playing half life then the mouse cursor got stuck in corner i was raged and crying but nvm it got fixed thanks bro!