Much thanks to all that post in this forum. In the past 2 years since owning 3 of these ASUS units this forum has been by far the most helpful.
Background intro: My setup is quantity 3 of these Zenwifi AX units. All are only in AP mode. I purchased them to leverage the 3rd band for a high speed bridge for a few wired devices at different points in the home where I did not have wired Ethernet. It is only since the last two firmware updates that I could go a complete week without having to reboot the system as the 3rd band would drop leaving the mesh running only on the 2.5 slow band (yellow line). Indeed it was so frustrating that I finally decided to spend the money to install Ethernet to enable Ethernet backhaul between the 3 units (which I understand was also troublesome until the past few updates). My general goal is stability sufficient to allow for only monthly reboots. Prior to this most recent update I have not been able to get past a week. Finally I am now at ten days and cautiously optimistic.
Additional info on this latest release: I also have seen “tainted” entries in my log since the last update, but they were for the http daemon. Also on the first reboot after this most recent update while the Ethernet backhaul came up fine and was showing traffic one of the mesh satellite units had an entry in the wifi log as being connected via the 2.5 even though it was on Ethernet backhaul. I rebooted the system again and that issue cleared.
Prior to buying this ASUS system I had three Apple AirPort Extreme units in a different home that ran flawlessly in AP only mode between monthly reboots. Hopefully ASUS will get us to that point while this hardware generation remain supported :-)
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