Same issue:

AXE5400 Tri-Band Deco with Xe75 Pro Mesh routing goes wildly unstable after firmware upgrades

update firmware :   1.2.9 Build 20231225 Rel. 57498 

  @itstruemental 

YES - SAME ISSUE!!!!

75 Pro 3-pack

Version 1.6

Firmware 1.2.5 build 20231226 rel 75366

My ISP was down for three hours during which my entire LAN was not working!? There is no reason that I know of as to why my internal network was not communicating.

After internet was restored, and my LAN was still down, I rebooted the DECO. 

I have 31 devices and 17 were showing “offline” of which only 4 were truly offline? 8 items were WEMO wall plugs and switches, several Ring Cameras & 2 Chime Pro extenders, 2 Alexa devices and 1 was a lighting hub that is “wired” to a satellite. 

I waited 24 hours to see if DECO would stabilize - did not. 

Rebooted again and now most are reconnected yet voice commands to operate WEMO devices not working (although they now work via WEMO App) and still showing 9 devices offline - my iPhone and two lights that are connected and working.

This system is very frustrating, takes constant attention!

Should be flawless connectivity. WHY are stationary devices constantly dropping out and being displayed as offline whether they are connected or not - no logical reason for this to be happening. I have had a single router and a two-satellite system that ran these same devices for years without this much hassle.

I have had a Deco Senior Engineer access my network for 1 ½ hours - they could find no issues.

Suggested I move Ring devices to IoT network at 2.4 Ghz only - did that prior to this most recent incident where many of them still disconnected. WHY should I have to do this separate network when your recommended “connection preferences” defaults are AUTO? 

VERY flawed firmware.

What is wrong?

  @Lihp  yeah - i'm shocked this isn't a bigger issue.

This is a major flaw.

It renders your entire network backbone unusuable. You literally can't wait for support beyond 24 hours.

I bought one for a business, and am reluctabt to upgrade.

I would have taken it back, but it was beyond the purchase 30 day return period.

  @itstruemental 

Wow, I can't believe it's only the three of us!?

Or maybe we just have lemons.

I have asked for a refund - I plan to replace this mess with a Netgear Orby Wi-Fi 5 which ran these same devices for years flawlessly at Half the cost!