Just sharing as it can save you from harm, … maybe 
Experiencing a lot of drop outs on my AV network on one port while testing a streamer.
All other ports working as intended, at least i think so 
There were/are no audible and visual anomalies experienced over time on other ports.
But, there were problems…!
The network configuration with problems:
1Gb/1Gb fiber uplink <-> MikroTik RB750GSi <-> Cisco 2940CG <-> Zyxel Gigabit switch unmanaged <-> Raspberry Pi 4 with vitos and ropieee.
This had massive dropouts resulting in connection loss and problems with audio.
At first i thought it was the RPi that was faulty or Vitos, so i tested with Ropieee.
The dropouts stayed, packet loss was at about 5%.
Packet loss on other ports was 0%, strange.
I had an extra Cisco 2940 1Gb uplink and 100Mb ports for testing that i replaced the Zyxel with.
After some configuration, i use VLANs, everything in place.
… no packet loss, music playing like it should, no drop outs.
This might be a compatibility issue with the RPi ethernet port and the Zyxel at 1Gb speed, but have not tested this, the Zyxel is not managed.
I did not test it with 2940 because it has no access ports with 1Gb.
Further testing will have to wait until i have an other switch in place.
On the Zyxel switch were also my H390, a Node2i and an Apple TV connected.
NEVER trust a (networking) device because it works so well, or have done so.
A stable network is paramount for a satisfying experience with Roon.
edit/
The Zyxel switch is a GS-105Bv3, had the RPi connected to the port labeled “high” as in priority.
Maybe the prioritizing feature is cause for the issue, not sure but it could be.
