[BUG] ubuntu = game freezes the computer

hi

so each 10 mn or something like that my games freezes i can only use the mouse the keyboard is off i cant even do alt + f4 or f5, the only thing i found was to click in the bottom right corner so it brings the desktop then go into  the game again and it d work. i think it is a bug with a refreshing thing cos i see one black line for one or two seconds before the freeze, thats almost everything it d be great if you could fix it and all the other bugs on ubuntu