The keys of the wireless handheld box sometimes fail

Cause analysis:
① The battery of the hand-held box is low.
② Strong electromagnetic interference exists nearby.
③ If the hand-held box is not operated for a period of time, it will sleep. When it wakes up again, the key press time is too short.
Solution:
① Please replace the battery with a new one.
② Try to avoid electromagnetic interference area.
③ When the hand-held box is not operated for a period of time, it takes a long time to press the key for the first time when waking up.