I have a similar issue - since I have upgraded to firmware 1.1.0, Build 20200427 rel.80857.

I *can* cast from my phone to my ChromeCast Ultra and the ChromeCast Audio that are *both connected to my wired LAN*. I *cannot* see the other Google devices that I have on my network - they are all *connected to the WiFi*.

If I open the Google Home app on my phone, and got to the settings for my WiFi Connected Smart Display it says "Cannot see Kitchen display on this Wi-Fi network. Check that it's online and that your phone or tablet is connected to the same Wi-Fi network. My AX6000 is in "access point" mode. It's like it is isolating WiFi clients from SSDP or some other broadcasts that allow my devices to be discovered.

Im sorry i dont have time to sit about anymore waiting for hours of fault finding.

I was just amazed that i couldnt roll back the firmware by simply reflashing to a previous stable version.

If you can find a fix for that great please tell me the logical instruactions to follow to make sure 100% im not doing something ridiculous.

Its an EU model and i followed Your website directions from the /SE/ swedish support site and downloaded the latest there firmware.  EU FIRMWARE.

the bin file is named ax6000v1_us-up-ver1-0-7-P3[20200212-rel7095]_sign_2020-02-12_15.01.07  *US firmware" ???

Is this the issue with the incompatability?

Please fix this nonsense.  Ive reverted back to my Trusty ancient linksys ac1900 and it took back with minimal effort and only having to set up every google device again......once.

clearly a huge problem with this mystery firmware you pushed to the EU V1. AX6000

We are both working from home, im an idiot for updating firmware during these times but wat can i say.... dont expect this much of a balls up. 

I move house in August, i really wanna be able to rebuild the network there using this Hardware at the core but im seriously doubting......

And, it's mysteriously "fixed" for me.

Things I did:

I rebooted the AX6000 

I changed the settings in the "Guest Network" tab:

- put a tick in Allow Guests to Access Each Other, clicked Save

- unticked the "Enable Guest Network", clicked Save

(This was even though I wasn't connected to the guest network).

One of my Google Assistants needed to be power cycled as it was not (re)connected to WiFi.

I moved my phone closer to the access point and used the Google Home app to view the Google Chromecast and Assistant device settings.

Everything is now working as I expected. I've reversed the guest network settings, and moved back to my office that is at the edge of WiFi range, and everything is still working well. Annoying, but at least I've avoided having to do a factory reset :D

Grr! 

If you have any more problems please post back. 

glad you fixed it. fixed itself. 

I had the same issue

No wifi connection with several devices.

After 2 reboots all works fine now.

No dropouts of 5G and better signal.

For now i am happy (finally) with this new firmware.

one thing that helped my 2.4ghz clients was to change the mode from 802.11b/g/n/ax mixed to 802.11b/g/n mixed

my phone kept dropping connection and a laptop couldnt even connect. now all is good, just leave ax on 5ghz

@dro 

Good to know.

I wish this would fix my problem, but all my 2Ghz devices are connecting just fine.

It is the 5Ghz devices that keep dropping connection or wont connect at all.

Same here.

2.4ghz is fine.

5ghz is @#_!&€#

I'm having the same issues reported in this thread since upgrading to 1.1.0 Build 20200427 rel.80857.

For my use case I don't really need the 2.4 Ghz network so I tried disabling it and forcing the Channel Width and Channel settings.

This config as been stable for around 24 hours with a mix of 802.11ac and 802.11ax devices, like Macbook Pros, iPhone 11 Pro and iPhone XS, and they've all maintained connectivity and speeds since these changes. I haven't tried increasing the Channel Width yet.