ROG Rapture GT-AX11000 Pro I don’t know what’s going on with the router, the internet is always unstable, the ping is always high, please finally fix it

I bought a gt ax11000 pro router 4 months ago, this router's wifi is unstable, sometimes the wifi antenna disappears, the big problem is when I'm 20 meters away from the router and I'm doing tests on downloads and uploads, it doesn't work stably, my ...

ASUS GT AX11000 PRO GAMING ROUTER latest update is very bad, Signature version 2.394, Firmware Version 3.0.0.4.388_24721-ga818331, after the update now when I connect from my phone wifi speed test shows the download ping is 40ms and the upload ping i...