I've been using Deco XE75 Pro for quite a while and it's been amazing.

Recently I needed to set up a public web server at home, and I wanted to protect my home WIFI network, so I added a ER605 Omada router between broadband modem and XE75 Pro, wired them up using ER605's LAN port and XE75 Pro's 1G port (there's no WAN port because all ports are auto-sensing), and kept XE75 Pro in router mode, so that it has its own DHCP that creates an internal network to protect the devices inside it against the public facing network. In this way, I was able to connect my web server directly to ER605's other LAN port. I'm also using TP-Link TL-SG105E switch in the internal network to connect more computers.

A brief diagram is as below.

Since I introduced ER605, I've been experiencing internet dropouts in both Computer 1 and Computer 2 from time to time, usually a few times a day. When a dropout happens, most of the time I get errors like these:

DNS_PROBE_STARTED

DNS_PROBE_FINISHED_NO_INTERNET

other times I see errors like address not found etc. A few seconds later, everything gets back to normal automatically.

Phoned broadband provider and did all the tests - everything is good. Also tried running commands like "netsh int ip reset", "netsh winsock reset", "ipconfig /flushdns", "ipconfig /release", "ipconfig /renew", and none of those helped.

The internet dropouts are really annoying and I have no idea how to fix it. Please help!!

Thanks in advance!