See this screenshot of the Wireless Diagnostic performance monitor: http://imgur.com/a/fe017

Noise (blue line) rises, signal-noise-ratio (red line) drops when I plug it in, reverts when I unplug.

There are some reports and rants ([1], [2]), but nothing widespread.

Notes:

* also happens when I plug in a plain-old-USB external hard drive with the original 9$ Apple USB-to-USB-C dongle, though less extreme. So it's not confined to this hub, or crappy cheap dongles.

* the problem/interference vanishes when you pull out the plug just a tiny bit.

* with the hub plugged in, AppleWatch unlock often doesn't work, so it seems to interfere with Bluetooth (also on 2.4 GHz), too.

An Apple FAQ [3] suggests to move the device, or plug it into the front or right ports ("you're plugging it in wrong" :-), but that doesn't seem to make a big difference for me. Alternatively it suggests to switch to 5 GHz WiFi, which obviously isn't possible everywhere.

Is anyone else seeing this? Is everyone using 5 GHz WiFi, or super strong WiFi, or not using USB-C hubs and dongles? Or is there something wrong with my machine?

Thanks, any input appreciated (check Wireless Diagnostics -> Window -> Performance :-)

[0] http://www.satechi.net/index.php/metallic-series/satechi-slim-aluminum-type-c-multi-port-adapter-with-type-c-charging-port-4k-hdmi-video-output-and-2-usb-3-0-ports-space-gray

[1] https://www.youtube.com/watch?v=_u3EBxuAPXQ

[2] http://forums.macrumors.com/threads/new-macbook-pro-wifi-drops-when-externals-connected.2012327/

[3] https://support.apple.com/en-us/HT201163#17