Nighthawk RAX80 network problems

I used to own Orbi and just recently upgraded to Nighthawk Router AX8. Since then, I have had problems with network connections.

First, we couldn't use AirPlay any more until turning off AX feature from the Router.

Doing that didn't fix another problem of my HP LaserJet Pro M275 not able to login to WiFi network. I ended up having to plug LAN cable and setup with IP address on PC and MAC, but no Air Print.

The last problem is that Network devices stopped showing up on Macbook Pro. When I goto Network in Macbook, it's empty.

I suspect there is a single root cause that is causing all these issues. I'm still deciding whether to return my router since I can't use AX feature and still have many issues.