Go to the control panel to see if there is any problem with the keyboard settings. Press the ALT key and CRTL key alternately. The computer sometimes makes this error~~ If it doesn't work, open the program that specializes in hardware and check whether you are using it. Bring the soft keyboard down first! If you press SHIFT 5 times in a row, you will see what is pulling! Maybe the problem is in one of the settings, maybe a virus.