No idea how I'm supposed to tell what the hardware version is.  It's not labeled on the device and the app doesn't show it.

I've got a mix of XE75 and M5 in my house.   The main XE75 and the other two XE75s are centrally located, the M5s are at the edges (basement, attic etc).

Today (again), the Deco app on my phone said that 2 of my Deco's were offline (1 XE75 and 1 M5). 

I went to look at both Deco's and they both showed green - which of course indicates that they are connected.

I connected my laptop to the offline XE75 with an Ethernet cable.  

The laptop network settings showed that it detected the cable, but it reported No Internet.

Then I disconnected the Ethernet cable and connected the laptop over WiFi with one of the other Deco's that was online.

I opened a command window and pinged all my Deco's.  They all responded to the pings, except for the two that the app said were offline.

So, the app is correct - the two really were offline.  But meanwhile, both the offline Deco's happily showed green.

I can't see how this is anything but a firmware bug - the fact that the Deco is offline but showing green.

This is on top of the underlying questions - Why Do These Things Keep Going Offline ???  And Why Don't They Reliably Recover On Their Own ???

I have to assume that these behaviors are due to firmware bugs as well.

Update - after about half an hour, I decided that the offline XE75 wasn't going to come back online on its own (sometimes it does, sometimes it doesn't).

So I cycled its power, and pressed "Try Again" in the app repeatedly, until the XE75 came back online after a minute or two.

Then, the app showed that it was connected to the main Deco XE75 with a "Strong" signal.  

Which again, begs the question, Why Don't They Reliably Recover On Their Own ???

Has anyone else observed these behaviors ?  Have any suggestions ?

Thanks