1) When the above fault occurs, it is generally related to the unstable power supply of the USB interface. If the wireless receiver is connected to the front USB interface of the system at this time, try to replace the rear USB interface. You can also try to connect this keyboard and mouse to other computers to confirm whether the same fault exists to confirm whether there is a problem with the USB interface.
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2) In addition to the problem of USB interface voltage instability, wireless keys and mice may be caused by wireless signal interference, such as wireless network cards, wireless routing, etc., these devices use 2.4Ghz wireless frequency bands at the same time, there may be interference between each other, at this time, environmental interference should be eliminated and then confirm the fault.
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3) Check whether the battery of the wireless keyboard is still charged, and replace the new battery to confirm.
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4) If the above steps do not solve the problem, it proves that the wireless keyboard and mouse itself has a hardware failure, and it can only be repaired or replaced at this time.