Yes, I've tested @stangri's luici-app-advance-reboot and it works good. However I cannot add it to my prebuilt (it refuses to build from source) yet. If he/she can publish his/her patches to upstream, it wold make a great value addition to the device!
And I'm glad to know that it is working. As @anders said, it looks like it's not performing rock solid in the 2.4GHz band. We need more testing before saying so, by the way. For now we just have 1 (one) calibration board to test: ah_Y9803.
I will upload a new prebuilt soon because I see that nginx is painfully slow and it wastes too much resources. But for applying it you will need to do a factory reset... again. I promise that this will be the last prebuilt that requieres a factory reset.
Someone messed up with OpenSSL in upstream so you will need to access LuCI using HTTP (not HTTPS) unless you have your own self-signed certificated (is a good idea to have a backup of it instead of adding random certificates each time). I've changed nginx with uhttpd and it breaks the the device.
PS: The GOOD thing is that now that I know how this works, I pick the best performing calibration for 2.4GHz and 5.8GHz individually! So don't worry about 2.4GHz not being so good right now. With enough feedback we can optimize this device to the max!
About uhttpd and TLS: this is interesting. It worked previously until this commit.