Hi @Erik_van_den_Bergh ---- Thank you for touching base with me and providing the requested feedback. Both are very appreciated!
Moving forward, If I am not mistaken the Zyxel GS 1900-24 is a 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 in the past.
-Eric