Canon EOS 1D X Mark II - Manual (Page 136)

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If the transmission rate drops, the connection is lost, or other problems
occur when using the communication function, try the following
corrective actions.
 When using the transmitter indoors, install the device in the same
room where you are shooting.
 Install the device higher than the transmitter.
 Install the device where people or objects do not come between it
and the transmitter.
 Install the device as close to the transmitter as possible. In
particular, note that during outdoor use in poor weather, rain may
absorb radio waves and disrupt the connection.
If the transmission rate of a wireless LAN drops because of the
influence of the following electronic devices, stop using them or
establish a connection further away from them. In addition, switching to
a wired LAN can resolve the problem.
 The transmitter communicates over wireless LANs via
IEEE 802.11n/g/b using radio waves in the 2.4 GHz band. For this
reason, the wireless LAN transmission rate may drop if there are
nearby microwave ovens, cordless telephones, microphones, or
similar devices operating on the same frequency band.
 If a wireless LAN terminal on the same frequency band as the
transmitter is used nearby, the transmission rate of the wireless
LAN may drop.
Communication Function Setting Notes
Access Point and Antenna Installation Location
Nearby Electronic Devices