When I connect my External HD my WiFi stops working.

When I connect my External HD my WiFi stops working. Anyone knows why?????

I do have the same problem with my MBP 15" (late 2013) on the right USB-Port as well. It still works when I use the left one.
As the external hard drive has its own power source I suggest it doesn't have anything to do with the difference regarding the provided power of the right and left side...(?)
Is this problem solved yet?

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