I have an Eero 6 WiFi Mesh system.  I have my Xfinity Xfi modem in Bridge mode due to this.  I have used the Eero system wiith my Xfinity internet service for just short of 2 years.  It has worked fine until about 2 weeks ago.

About 2 weeks ago I had no internet.  The red light was on on all the Eero units showing no internet.  I clearly had no internet.  The Xfinity X1 modem was showing a solid white light which I believe means it has internet.  I had concerns that may mean it's the Eero system.  I talked to Xfinity and they said there is no outage. As well they twice reset the modem and it didn't fix the issue.  Then I talked to another agent who said she can reset the wifi.  I figured this may take it out of bridge mode but desperate for internet I gave her the go ahead.  After the reset my internet came back.

At this point I logged into the modem and it showed it was no longer in bridge mode.  I figured the issue is my Eero system.  Yet odd thing is the light on all Eero boxes was now solid white which should mean the Eero system has internet.  I know it's not good to use the Xfinity modem out of bridge mode when I am using a router since there are technically two networks under the same name plus I may not always be connecting to my Eero system.  Yet I used it like this for nearly two weeks and had no issues with internet.

I decided maybe the Eero or Xfinity modem somehow got hosed up so yesterday I logged into the Xfinity modem to put bridge mode on.  Unfortunately soon as I did had the same issue.  The Eero boxes all had the solid red lights and I had no internet.  Solid white light on Xfinithy modem.  This time I used a paper clip to press the button on the back of the Xfinity modem for a few seconds to reset it.  When it logged back in there was a flashing white light on the modem.  I now had a wifi network called XPSetup and my Xfinity app showed I had to set up the Wifi network on the modem since that was reset. As well the light was a solid white on all my Eero boxes.  I clearly had good internet so now I don't believe the issue is the Eero system since I was able to use them for wifi and had internet.  Yet I imagine it's not a good idea to use the Xfinity modem in setup mode.  As well it seems the internet was not reliable.  When it worked it was great but it would be on for 5 minutes, off for 5 minutes, on maybe an hour, off 20 mins, etc. and was like this all day yesterday.  I assume this was due to the Xfinity modem being in setup mode.

Then late last night I used the Xfinity app to setup the wifi network.  Ever since I have done this it's working fine.  As well the light on all Eero boxes is solid white so again I have both Eero and the Xfinity modem putting out the same Wifi network but it's very reliable and working fine with no dropouts.

I just can't figure out where the issue is. I'm using the newest firmware, 6.10.0, and I didn't update just before this issue so I don't think it's a firmware update issue.  I just can't get why this has worked so well only to not work now when the Xfinity modem is in bridge mode.  Has Xfinity changed anything on their end? I have wondered if maybe they prefer customers to buy their own mesh system so have somehow made it not work with your own router or with the Eero system.  I'd like to get it fixed so it works like before with the modem in bridge mode and my Eero system handling the WiFi.

Another question I have is about having it out of bridge mode. I have heard if you use your own router put the modem in bridge mode.  I also know you don't want two devices using the same network name.  Is it an issue if I create a different network name than what my Eero uses.  Example instead of making them as both "Home Network" maybe keep Home Network on the Eero system since that is what all my devices are set up for and I want to use that but then make the Xfinity modem use "Xfinity Net" or something like that.  That way it's not in bridge mode but I don't have two devices creating the same wifi network and don't have to put the Xfinity modem in Bridge mode which seems to be where the issue is.

Thanks in advance for any help.