RAX120 slowing down the AX connection to a few Mbps

OP. It seems that disabling the AX from the router admin page solves the traffic stall issue, but I'm not sure yet (it's much more stable, that's for sure). I'm still testing it, but turning the router into an 802.11ac one seems to work. So basically I have a wifi6 router (on paper) that only works as wifi5. Still, it's slower than the router the ISP provided (an Arris modem+wifi router combo). Wonderful! However, I still have the wifi network dropouts now and then. I have "solved" this issue for the moment by plugging the router to the AC outlet via a radio remote controller (formely used to control some spotlights in the library). So when I don't see the router anymore in the network, I just press twice the radio remote (once for power off, second time to power it up) and wait for it to boot. Isn't that fantastic?

Oh, and BTW, about the buggy admin page GUI: did a little bit of debugging work, just for fun... There are plenty of Javascript bugs; also the CSS is very poorly written and buggy. Who wrote that piece of "code", Netgear? :)

I'm only keeping RAX120 on for now becasue I want to test it a bit more, but otherwise I'll have to return to the old one soon and forget about this... thing...