The reasons may be as follows:
1, the computer USB interface problem, repeated use, hardware damage or aging, it is recommended to change the interface.
2, may be poisoned, pay attention to the recent did not open do not go to the safe website, it is recommended to download the soft kill poison try.
3, system problems, the system may be unstable, it is recommended to install genuine.
4, may be caused by the poor contact of the micro switch, buy a switch unit, replace it, or the left key and the middle key switch exchange, because the middle is not commonly used.