Canon EOS-1D X Mark III DSLR Camera (Body Only) - Manual (Page 729)

Communication Function Precautions
In case of slower transmission, lost connections, choppy image display, or other problems
when using communication functions, try the following corrective actions.
Access point and antenna installation location
When using the camera indoors, install the access point in the same room where you
are shooting.
Install the device where people or objects do not come between the device and the
camera.
Install the device higher than the camera.
Install the device as close as possible to the camera. In particular, note that during
outdoor use in poor weather, rain may absorb radio waves and disrupt the connection.
Nearby electronic devices
If the wireless LAN transmission rate drops due to interference from the following electronic
devices, stop using them or establish a connection away from them. Otherwise, switching to
a wired LAN can resolve the issue.
In IEEE 802.11b/g/n wireless networks, the camera communicates on the 2.4 GHz
band. For this reason, the wireless LAN transmission rate may drop if there are nearby
Bluetooth devices, microwave ovens, cordless telephones, microphones, smartphones,
or similar devices operating on the same frequency band.
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