The most likely the cause is that the mobile or client system is moved too far away from the access point.
A wireless network is known to be a form of computer network where one uses only Radio Frequency (RF) connections instead of the use of wires or antennae.
Note that the most likely the cause is that the mobile or client system is moved too far away from the access point and as such when the user is close to the Wireless connectivity, it will work very fine.
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