@Kevin_Z My ISP requires setting the static IP in router. The connection is stable when disconnecting router and connecting directly to PoE adapter (provided by ISP - it powers a modem on the roof, I...

@StinTheGreen Hello. I have exactly the same router and firmware. I just set my MTU to 1480. I used this article to get to this number How to find the proper MTU size for my network | TP-Link. I...