I just went through the h*ll of setting up a Chromecast Audio on my Deco e4 network, I tried the disable 5G to no avail, rebooted the Decos and still not able to connect... my workaround plan was to...

@kaja69 In AP mode the guest network is not separated from the main network.

@matthew.mfden if you are running in AP mode, then you should be able to run your main network on 5G and your guest network on 2.4G and give them different SID's.

@TarAlacrin you could try to power of your other Deco devices and only leave the main unit on and see if you get the same behaviour. How is the signal level between the Decos in your mesh?

I understand that a in-addr.arpa. request are done when a new device appears on the network, but running the request every 20s for all seen hosts on the network is not good practice. In addition to...

The e4 in AP mode send's out a mDNS in-addr.arpa. request every 20th second. I'm not sure if these are only sent on the ethernet or also on the wireless side, currently I'm not able to capture...