Plex is freezing/lagging when playing 4k remuxes on nvidia shield

Hello, I am having some trouble playing 4k remuxes from my PC to my Nvidia Shield TV (2019). It works fine for around 5-20 minutes, but suddenly it starts lagging more and more until the app crashes.

I have updated to all the latest versions, and both the Shield and my PC is connected via ethernet on a 300/30Mbps connection. I have checked that my movies is direct playing.

I have one CAT-5e that goes to a gigabit internet switch, which splits to my media PC, Shield, TV and another computer if this matters.

The HDMI from my Shield goes through my Samsung Q90R Atmos soundbar, and to my TV.

PC Specs:
GTX 1030
Intel i5-7400
16GB RAM
2TB + 3TB Seagate Barracuda HDD
Kingston SSDNOW 240GB SSD

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