Potential sources of Wi-Fi and Bluetooth interference
Maybe there is more here, see—Grant Bennet-Alder
https://discussions.apple.com/message/33794588#message33794588
Using USB devices with your Mac
https://support.apple.com/en-us/HT201163
Cable Recall:
Power Adapter cable recall
Apple USB-C Charge Cable Replacement Program - Apple Support
https://www.apple.com/support/usbc-chargecable/
firmware update for the Apple Multi-Port display adapters (specifically to reduce interference).
About the USB-C Multiport Adapter Update 1.0 - Apple Support
https://support.apple.com/en-us/HT205858
LG-display recall -- to address Wi-Fi interference so severe, it knocks the Router off the air if too near the Router.
https://9to5mac.com/2017/02/03/lg-fixes-wifi-interference-problems-with-ultrafin e-usb-c-5k-display-new-units-unaffected/
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more info—
Why does my wireless mouse or keyboard slow or not work properly when used with the hub?
Most USB receivers for wireless mice and keyboards operate in the 2.4Ghz band. When connecting the receiver to any USB 3.0 port there is potential for interference that can affect the devices performance. The most effective method is to add a short USB 2.0 extension cable between the hub and the receiver to mitigate the effect, and many wireless keyboards and mice come with such a cable for this reason.