RT-AC5300. Dirty upgrade. No web interface problems after reboot. Actually the interface was more responsive than before. Speed test is working but seems slower than the browser based version. Only issue I see on visual inspection, which may have already been reported, there's no icon/image...
I started using Asus Merlin around December 2019. I switched to Asus Merlin because I was having the same exact types of issues. Devices would get kicked off wireless and then certain bands would stop working. I tried multiple different things that were directly related to wireless settings...
When Asus released version 3.0.0.4.384.81219, my RT-AC5300 locked up after 10 days. I did a factory reset and then upgraded to Merlin 384.14_2. Still locks up after 10 days. I have to restart the router when it happens. May have to roll back to an earlier version once again.
I was interested in using the Merlin firmware because of this very issue on my RT-AC5300. It started after I upgraded to the stock firmware 3.0.0.4.384.81219 that was released on the Asus site dated 2019/11/07. I would look at my Network Map and it would show one device yet have a superscript 2...