Hi, it seems like after I left RT-AX68U idling, rebooted and power cycled several times, there is no more WEBUI page.
I wasn't doing anything with the addon, just adjusting some other settings and dealing with changing ethernet cables, swapping devices, normal maintenance stuff.
In SSH it says "GUI page not found" - perhaps it was never there for AX68U, I also use AX86UPRO and all is fine there, though I wasn't rebooting or power cycling it for a while.
This is a brief report to just note this, while I'll investigate deeper later when I have more time as I have more urgent matters at the moment.
UPDATE:
I might have ungracefully disconnected the USB sata SSD or something, it was several days ago, and I remember something odd or something suspicious, I went "oh rats", I didn't intend to do something when resetting, but now I forgot what exactly I did. Perhaps I turned it off again shortly after it was in the boot-up process, maybe right when it's polling for USB devices. I do remember I had to turn it off for several hours to clear caches as I was setting some upstream and downstream stuff up, got stuck and didn't want to detect presence, powercycling the whole setup fixed it, but when I got back, no more Stats page.
But Entware and Diversion seem to work fine.
UPDATE2: Seems as if it's working in the background, log shows it loading and doing stats stuff, at least by the log reports, however there's no more entries reportng "Mounting WEBGUI .... user2.asp" like in prior occasions.