WiFi could also interfere with other frequencies if a non-linear device is nearby. See: https://en.wikipedia.org/wiki/Intermodulation#Passive_intermodulation_(

WiFi could also interfere with other frequencies if a non-linear device is nearby. See: https://en.wikipedia.org/wiki/Intermodulation#Passive_intermodulation_(PIM) https://en.wikipedia.org/wiki/Intermodulation#Passive_interm... The article does not consider this, but it works with light as well as RF.