Ziggo ISP-Supplied Modem/Router: Roon arc external ip problem

Roon Core Machine

2017 MacBook Air

Networking Gear & Setup Details

Ziggo (Internet & TV, using the wi-fi router on their modem)
KPN NL (My phone/mobile internet provider)

Connected Audio Devices

iPhone SE (2020 model, 64 gb storage)
Terratec Aureon 7.1 USB sound card connected to a set of Presonus Eris 4.5 BT monitor speakers.

Number of Tracks in Library

About 30000

Description of Issue

I have the same issue. At home on wi-fi ARC runs perfectly fine. But if I turn off wi-fi and my iPhone uses my 4g connection nothing would play and often getting the “poor connection” message. Which is odd because all other apps that I’m using have 0 problems with my 4g connection. This includes Qobuz, Apple Music, VOX, HBO Max and Amazon Prime. Even streaming full hd doesn’t result in stutters.

I’ve tried ARC as well in my car and at work, but resulting in the same issue. On top of the app you see a progress bar that keeps spinning without end, and then the “poor connection” message will show up, or not at all.

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