I have the same issue. I don't believe its Chromcast because it happens periodically to all of my 3 CC devices. It can either be a CC software bug, or Eero WiFi which they all have in common. I can ping them while they are undiscoverable. Unable to see them either in Google home App, or LocalCast App. 

Jeff 

I decided to turn off the guest wifi and the CC started to show up. Another thing I thought about was that my phone connects at 5Ghz and CC is at 2.4. 

I wish that was the issue, at least we'd know for sure, Both phone and AP were in the same SSID. Guest had nothing on it. I was just trying something different to see of something would change and it did. Let's see how long it lasts :)

I have this exact same issue, right down to the guest access fix! 

Chromecast is showing in the Eero app as connected, but using Fing it doesn't show up on the network. It is receiving network data though as it cycles news and photos etc. However Android can't find it on the network either. 

Then the moment guest access is turned off on Eero, the Chromecast connects again. Note my SSID for guest is different to normal network, and neither of my devices is on the guest network (nor has even been setup to connect to guest... So there is no risk that one was on guest and the other was not). 

I am using Chromecast 2.0 if this helps. 

O. 

So far, after turning off Guest network, my 3 Chromecasts have been discoverable and without any more issues. 

I see Eero patch coming eventually :).

By the way, love my Eero!!!

mannycal70@gmail.com I've posted this on Reddit - you may wish to share your experience there also for the active members. Your post certainly helped me, so thought to share. Link is https://www.reddit.com/r/eero/comments/5xeof1/chromecast_issue_with_temp_fix/

I am also starting to have this issue on my eero as well.   The fix people talk about does not work for me, as I don't have my guest network enabled.  My eero is in bridge mode.  When I look at connected devices on the app, it is the only one to not show an IP.  I checked on in the gateway, C1000A, and it shows an IP there.  Gave it a static just to be safe, but still having the same issue.

I also have issues with my three Chromecasts (Gen 1). They connect to the eeros fine. They show up in my apps as castable devices, but when I go to cast from any app, the TV just shows it is loading the stream, but the stream never starts. My Chromecast 2 and Chromecast audios do not exhibit the problem. 

I called in and the tech suspected it has to do with the original Chromecast being limited to the 2.4ghz band and the new 2+ eero software causing the Chromecast 1 to keep trying to connect to different nodes when starting a stream. He said he took notes for engineering, but looks like we are out of luck until a fix is delivered by eero. 

Jeff C. 

Sure. Like I said. I called in and he said it was not a known issue but took notes. The Request # was 102808. 

I am having same issue. Multiple chromecasts, all except the one built into vizio have this issue. Rebooting chromecast does not help. I have to unplug each eero and reboot the entire router network :(.

I have the Chromecast v1 and v2's (2.4 & 5ghz versions).

This doesnt happen when i use my dlink or netgear routers, only eeros.

Discovered an interesting linked issue. While watching through Chromecast (while working), disabling the Guest Network will cause the Chromecast to temporarily disconnect, then reconnect to the Eero network. So there is something going on between the guest network and the Chromecast.

To be clear, the chromecast has never been registered on the guest network, and my guest network has a completely different SSID to main network.

Oh that's interesting. Thanks for letting me know. 

Oddly enough for me I was having the same issue with the guest network already disabled. I went ahead and enabled the guest network and boom the chromecast is working now.