Checked my WEMO app just now and three devices are still missing, but not the same three as last night. Checked the EERO app, and all three are showing as connected to the mesh, with a strong signal. 
 

I do have a general question about my EERO set up. I have two WEMOs and the Raspberry Pi in my office and another WEMO just outside my office, located on the second floor. In the office the cable modem is connected to the main EERO base with Ethernet. Yet all these devices show up as connected to the EERO in my basement, 2 floors away. Why?

Right now I have everything turned on except WP3 and I have all my WEMO devices showing and working right now. That will probably change. 
 

I’m starting to wonder if my ISP also has a hand in this mess. Last year, prior to getting the EERO mesh system I was having problems (sometimes) with email hosted on another server.  If I tried to access with LTE on my iPhone, no problem. Also had problems with web sites hosted on that same server. My ISP insisted that they weren’t the problem, so I installed a VPN, and mail/access problems went away. The only problem with the VPN is that some sites refuse to allow access via a VPN, so I frequently have to turn on/off. This won’t help with WEMO though unless you can set up a VPN between EERO and modem, as right now the VPN is on individual computers/iPads/iPhones. 

I just turned on my WPA3 and all seems to be well right now. Spoke too soon, three devices just disappeared.  Now another device just vanished. Did a refresh and one device came back. 

Seems that WPA3 on was causing problems with some of my other devices at least through HomeBridge. Had to restart HomeBridge, but for now I am leaving WPA3 off. 

Shortly after writing the last post (next day) all seemed to be working properly. In an attempt to find a solution to the on again / off again issues with WEMO devices I decided to try an EVE Energy plug and it seems to work just fine, if a little slow to respond at time. After testing this unit for about a week I decided to order 5 more. I was starting to wonder if I was  spending money unnecessarily as the WEMOs were all working flawlessly, until tonight when all but one device went AWOL again. So when the EVEs arrive next Wednesday all the WEMOs are being taken down and replaced with the EVEs. As to the switches, they are being replaced with Insteon units. This may be a bad plan as it seems that Insteon is dying, although the new Nokia Lamp products seem to replace Insteon and their new hub may also support the Insteon switches in the future. 

I find that the Insteon switches work reliably, although they don’t always report their current status correctly. Although Insteon does not currently support HomeKit (ignoring that dubious HomeKit hub they used to have), I do use my Insteon switches with HomeKit via Homebridge. 
 

One of the reasons that I like the Insteon devices is that they support the older X-10 technology which is supported by HomeLink that ships in many cars. I use the HomeLink to open/close my garage door, and also to turn the garage ceiling lights on and off. The only other option for controlling lights from HomeLink is a proprietary HomeLink system that I don’t believe integrates with any other system. 

Same issues as everyone else, except with Wemo switches. Same actions taken to rectify situation. When 1st installed Eero no issues with connecting the Wemo switches, in fact they worked better than the old router. Then they just quit working. James, add me to your email list please. I prefer email to hours on the phone.

I replaced all my WEMO plugs with Eve devices and they seem to be pretty good (the fact that they use Bluetooth is not an issue as my Apple TV hub effectively makes them accessible away from home).
 

The only WEMO devices that remained were 3 wall switches, but now two of those have been replaced with Insteon switches.  While I was waiting for the Insteon switches to arrive the three remaining switches were variable in terms of behaving properly. There were some days when all 3 worked, some when none worked, and many days when only 1 or 2 worked. Even on days when none were available in the WEMO app and/or HomeKit, programmed settings worked because they were saved inside the switches.

The last switch that is still installed is located in a front hall closet controlling outside soffit lights; basically it is programmed to turn lights on 15 minutes before sunset and turn them off at midnight. I don’t really need to remotely control that switch, so may just leave it in place and put the third new Insteon at another location that I have identified. 

While the Eero firmware update may have initiated these problems, all my other devices work properly, and so I believe that WEMO is the real source of the problems. For example all my other devices are 2.4 GHz only and yet don’t have problems with dual band operation of the network, just the WEMOs. 
 

Also problems with WEMOs connecting to the network predated the Eeros. In fact the acquisition of the Eeros was due to ongoing problems of WEMOs and other devices disconnecting from the network. The Eeros significantly improved overall network performance. 

Coupled with the way that Belkin bricked their netcam, and how hopeless their HomeKit bridge was, I for one am glad to be done with their products