It can be that the battery of the keyboard is low, and the common reasons for this situation and solutions are as follows:
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1, the battery is insufficient, replace the new battery, if it is a rechargeable battery, it needs to be fully charged.
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2, the receiver contact is not good, re-plug a keyboard signal receiver.
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3, the keyboard is broken, replace it with a new keyboard.
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4, there is strong magnetic field interference around, away from the interference source.