Not sure if this is the right place to continue this topic, though it does seem related with the current GPL, including what is used for this version. I have been having instability with only one of my two nodes (BE86U with issue, BE82U no issue). IoT devices most notably would consistently lose connection, often within a day, sometimes intermittent in either direction. This is fairly consistent across firmware versions, both Merlin or stock.
Yesterday, I saw a post with reported DHCP issue when using wired VLAN, so wondered if the wired VLAN config I use for a single IoT device on the BE86U could be causing the connection drops. I changed the VLAN back to All(Default) / Default and following the change have not had a single device go offline on any node. While this has only been 1 day, 8 hours, 20 minutes; I would have had devices dropping off by now on the latest stock firmware. I have a ticket open with Asus since the GPL is closed and will report to them as well should I find that this is causing the IoT stability issues. My desire is to be able to use the wired VLAN without impacting wireless IoT VLAN, so hoping this helps isolate the issue if it does prove to be the source of the instability.