Hi @Stefan_Hansen ----- Thank you for touching base with me and providing the requested feedback. Very appreciated!
Continuing forward, I did some research into the mentioned switch (i.e the Cisco SG200-50) and can see that it is a smart managed switch and we have seen a few issues crop up with these devices in the past (Example: #1, #2, #3, #4). I would recommend enabling flow control on the switch, as we have seen it help other users.
Additionally, I noticed from your follow up that the mentioned QNAP TS451+ NAS is making use of an Intel Celeron 2.41GHz dual-core processor which has the potential to cause performance issues as it is falling below our recommended specs. Does the device have an SSD installed for your Roon database?
I am merely pointing out the above as a, “head up” because I want to make sure that you get the best experience possible while using Roon, and if there is an underpowered device driving the system you may encounter limitations moving forward.
-Eric