Massive packet loss over Ethernet backhaul

I have wired backhaul so I thought to try to simulate your case, so I connected my laptop with a LAN cable to the router, disconnected the wifi network (did not disable wifi) in the laptop, started command prompt and typed the ping message, and guess what, I got packet loss exactly as you did, BUT.....

While trying to collect some date from Orbi I noticed that my speakers (usually connected to the satellite) started to blink indicating no network then I saw they got attached to the router, waited few minutes, I saw that my router rebooted, so I disconnected the laptop.

When I looked in the laptop IP configuration I noticed that I had it set up for a static IP address (192.168.10.101) outside the Orbi subnet and remembered that I did this setting last time when I was configuring a VoIP router for a friend. I really don't know how I managed to get LAN connectivity with this settings but it seems that somehow the wifi was sending the packets not the LAN port.

Of course the family at this point started to complain about loss of internet and I did not want to try again.

What I concluded from this short test -together with my previous experience with Orbi- is the following:

1. Orbi LAN ports are very sensitive to the wired devices connected to it
2. This "sensitivity" is more evident when you have wired backhaul
3. I should be cautious with devices that have wireless capability when using them as wired devices in Orbi, they can cause loops and system instability.

At this point I'm not sure what made my Orbi unstable when I connected my laptop, is it the bad LAN port configuration, or the loops caused by combination of wired and wireless connections in the same device.

I will try again later and see if I can simulate this case again. Meanwhile I have the following questions:

• Do you have any static IP settings in your wired computers?
• Are you sure that wireless is completely disabled in those computers
• Does the same issue happen if you disconnect one of the computers (one at a time) and ping from the other computer to any other device (wired or wireless), repeat the the same with the other computer? It can be only one of the computers is causing this issue.
• Is Daisy Chain Disabled? you mentioned that but please make sure it's unticked.

Another test that I would like to do, at later stage, to avoid loops in backhaul, is to disable the wireless backhaul (with telnet commands) and see if this will do any improvement.