I've finally got fed up with our previous mesh router, so I upgraded to 3x Eero 6 routers for our 2800 sq ft house.  The router setup was simple and worked great for the first 2 days.  The speed was amazing and everything was fine.  For the last 2 days, we've had lots of issues with intermittent drop-out issues, see below:
1) Apple TVs would "pause" while watching shows - for the first 2 days, we've not noticed any pauses.  Now it seems to pause quite often.  I ran a test on the internet, Eero showed no issues.  This seemed to have started happening after 6.4.0 update was done.

2) I get "unstable connection" reports from Zoom on my PC during my conference calls.  This also seems to have started happening after 6.4.0.  

3) Yesterday, I got a text from my son that the home internet is not working.  I went on the Eero app, and saw that the gateway is red.  So I clicked on it and ran internet speed test, and there was no issues, and then the whole system turned green and then all was fine.

Please help!  I would like to get back the experience from the first 2 days of the Eero!

I’m having nothing but trouble since the update. From devices that are already connected struggling to. One thing down to devices connecting but getting shoddy speeds like 0.1Mbps. Rang several times and tried all the trouble shooting steps. It’s got so bad I’m considering switching back to my Virgin Media Hub and binning off the eero seen as it’s effectively useless since the firmware update. Is there a way to roll back the firmware or choose a particular version? It was perfect before the update. 

Hi James , I'm having the same problems that carbonfiberunderpants and others have described in this thread. Are there instructions posted anywhere that have helped folks resolve the issues?

Same problem here as well - even called the ISP (Spectrum), had them roll a tech TWICE to take a look, and even swapped cable modems.  Having the same problems regardless, seeing multiple times of day where I'm getting ~20% packet loss (continuous ping to Google 8.8.8.8 DNS) - additionally, one of my eero's (NOT the gateway unit) that is wired is only getting max 100Mpbs download on a gig switch (and a 480Mpbs connection).

Heh, came here to say it’s happening to me too, and what do you know, page wouldn’t load since I was experiencing this very issue while trying to post about it :)

here’s another +1 on this and you’re all not alone.

on a single eero 6 (non pro) losing internet once or twice a day on all devices. Waiting a minute or so fixes it silently, without ever actually losing wifi connectivity (but websites don’t resolve for a bit until they magically do). 
already contacted support via email, so guess we’ll see if there’s any movement soon.

cheers!

Hi, for those of you who have some device can not connect to eero after firmware 6.4, but some device can still work. This problem can try to enable ipv6 setting under network setting. At least that work for me.

For those still tuning in to this thread:

Two weeks later, zero contact from Eero support on this issue.  I found a resolution, but you really aren't gonna like it...

Post-6.4, the Eeros just cannot handle as much traffic as they could Pre-6.4.  I don't know whether it's heat related (doubtful, as I had a fan pointed directly at the gateway Eero with zero change), a buffer overflow, additional features taking up too much memory, etc etc etc... but I did in fact find a solution that worked for me.  

I fired up a pfSense firewall as the primary gateway, and relegated the Eeros to ONLY access point (AP) duties by throwing them in bridge mode.  Haven't had hardly a dropped packet since.  The Eeros apparently can't handle the traffic in my house; only by essentially rerouting all of the wired traffic and stripping off all of the "features" the Eeros have in gateway mode can they reliably operate.  But, now the wifi traffic is great, and the wired traffic is great, and I'm at least getting SOME of the $300 wifi-5 features that I paid for.

So, if you have the means, reduce the traffic going through the Eeros by dropping them into bridge mode and come up with your own firewall/gateway.  The extra stress of having the eeros dole out IP addresses, manage DNS caching, reservations, stateless firewall, UPnP... they just can't handle it.

They do make a pretty nice access point, though.

PS - test it for yourself, drop a house-full of devices down to just one or two, and it works a treat!  Nary a dropped packet, stable as hell.

Having the same problems as others on this thread -- frequent disconnects, dropped packets and trouble loading pages -- ever since the new software release.  System was working great for over a year and then -- boom -- frequent problems.  I've tried everything -- making sure my modem is in bridge mode, restarting the eeros, power cycling modems and eeros, etc.  Very frustrating to see a working product fall apart like this.  Hoping that a software update is coming soon??