Well, I ended up connecting the problem lights to my old AC access point, and 24hrs later not a single disconnect has occurred. I somehow had managed to cause other issues with my AX58U where 5Ghz devices somehow weren't discoverable on the network, so ended up factory resetting that as well...
Well, it didn't quite work. The lights seemed more stable the first few hours but several have become unresponsive. The router reports them all as connected in the logs, but they won't respond to a ping.
I am already using the latest firmware, but thanks for the suggestion. It seems like...
Sadly it's way past the return window for my AX58U. On the plus side, it's been working pretty well this afternoon. Occasionally Hue devices appear to cycle their connection, but I think that's normal.
I ended up leaving Wireless Mode on 'Auto,' and set a fixed Control Channel to a minimally...
My bulbs started going offline with 2.4 in auto :(
But, it's a start! I'm not happy having to mess with Wifi to accommodate some IoT devices, but would prefer not to run a second access point just for these devices (which I have ready just in case this all fails).
So far my network is looking good after limiting the mode to Wireless-N in addition to all your other settings. I've noticed some persistent logged output has ceased, which may be related to the connection issues I was seeing:
eth5: Deauth_ind 84:B8:B8:58:F2:D0, status: 0, reason...
Thanks for sharing images of the settings you've tried. I've been having issues with some WiZ bulbs recently (model 23007, specifically) that can't maintain a wireless connection on an AX58U. I also have a Nest Hub that has always had issues with this router, but applying ASUS's recommended...