[VU+ Duo2] Cabled Ethernet connection kills my entire network

[panch]

I have had a weird problem the last couple of months. When I connect my Vu+Duo2 to my home ethernet, after some time everything internet/intranet related begins to slow down, and in the end everything becomes unresponsive.
This is normally mended by resetting my wifi router, but this never occurs when the Vu+ is NOT connected to my network. Anyone knows anything about this?

My internet setup:
Cable Modem
|
Wifi Router (Asus RT-AC68U, custom Merlin firmware, ver. 380.65)
|
Switch (Netgear FS105 5-port)
| | |
Vu+Duo2 MacMini Samsung Smart TV

 

[kryton]

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[Tkr001]

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