Been offline since I HW reset (WPS Method) the AX86 mesh nodes and flashed them with the stock firmware "Firmware version 3.0.0.4.388.21709" as I dirty flashed over 388.1 to fix the AIMESH interface showing disconnected and to start from a known good point. After seeing some of the posts related to Wifi and the AX86, though I feel I should share the results.
After restarting the mesh nodes, wired backhaul, I was able to add them back in without issue both via the browser, and the other via the iPhone app. But the 5Ghz radios did not immediately come up. The one Android Tablet with a Wifi Analyzer did not find any of the 5Ghz nodes. Took another reboot of the mesh nodes to get them turned on, even though through the browser and App I turned the 5Ghz radios off/on, they would not show up until after the second reboot.
After the reboot of the mesh nodes, the 5Ghz radios did turn on, and the devices that use that were able to connect flawlessly. I went back into the iPhone app and while 160Mhz was on previously, I had to toggle DFS back on as well, as if adding the mesh nodes turned it off.
The rest of this is observation, not quatifiable testing. Running Speedtest from the iPhone, which I do regularly for a baseline, I noticed my results were off. I typically achieve 600-700Mbs on the iPhone depending on all sorts of variables including what AP (mesh node - AX86s or router AX88). But for the first day or so I was see results in the 450-550Mbps range. Leaving it alone over the weekend, I also noticed that the 2.4ghz tablets and the one 2.4Ghz/5Ghz (on 5Ghz) I use to monitor the Nest cams stayed connected all weekend. When I was running 388 on the nodes as well as the router, if they stayed online for 12hrs it was a lot.
This morning, again running speedtest from the phone, both connected at the mesh nodes individually, then at the router. I achived a pretty consistent 600-700Mbps at the mesh nodes (AX86s - current Asus Stock Firmware) but at the router, 450-550Mbps (AX88 with 388.1) testing against different servers over a 30 min period to get a better average. I expect a little variability in the results download/upload and usually the delta is within 10-20 Mbps but now I'm seeing a 50Mbps delta or more (worse case 2x - 600/300), higher on the AX88. On the AX86s in line with what was my normal under 386.7.2 now.
The tablets are still up, connected to the cameras and running the live feed at the best quality, haven't had to reboot them since late Friday. Each AX86 Mesh node is wired backhauled GigE to the AX88, and have AT&T Gig fiber at the router. Because of my circumstances I prefer the uptime and consistency with the tablets and the cameras for monitoring vs. performance.
As far as the basics, this is how its setup. For the 5Ghz, if I select the 20/40/80/160Mhz ChannelHog reports I'm running at 80Mhz. If I use the 160Mhz setting, it doesn't ever complain and all the older devices still connect fine. Wifi6 enabled and I have a SmartConnect rule load balancing between both 2.4 and 5 Ghz. If you're wondering, the wired devices avarage in the 910/945Mbps range as well as the Router with spdMerlin (depending on CPU utilization at the router when the test runs).
Not sure what this does or does not add to the AX86 Wifi disconnects, just sharing my results/observations, your mileage will vary...