WiFi and USB3.0 Peripheral Issue on Surface Pro4

Hi, I am using my brand new Surface Pro4 for about a week. I noticed that every time when I am using either USB3.0 portable HDD drive or USB3.0 portable DVD player, WiFi (2.4GHz) slows down, disappears and cannot connect to internet in the end. When I disconnect USB cable from Surface, WiFi comes back instantly.

I do not think it is not my peripheral devices' problem because on my SONY VAIO and ASUS laptop those devices work just fine.

My Surface Pro4's drivers and FW are all up-to-date.

What would be the root cause? And how I can solve this issue without selling off my brand new Surface Pro4?

Thanks!

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