Nvidia Shield Pro 2019 suddenly started lagging when streaming from PC

[posnisir]

So, until yesterday I was streaming without a problem using SteamLink app from my PC (Ryzen 5 3600, R9 280x). However, since I first tried today, I get constant stream freezes (red icon in the bottom right) that last for 15 seconds on average. After turning on detailed SteamLink diagnostics, it seems like it's a client (Shield) problem, probably when decoding. My network is wired and, judging by the detailed diagnostics, is not a problem.
I tried all kinds of different streaming settings in SteamLink (although it always worked with those configurations, so it really shouldn't be a problem). I even tried factory resetting my Shield... To no avail.
Does anyone have any idea what's happening? Is there any diagnostic tool that I can try to test is my Shield having problems decoding video (maybe it is dying?), or is it on SteamLink's side (although there was no update on it either)?

SOLVED - A few hours after realizing the ethernet on the PC drops each time this happens, the problem was fixed by rolling back the Ethernet adapter driver (Windows 10). The working one is Intel Ethernet Controller version 1.0.0.9 (non working one was 1.0.2.6).