Need help isolating packet loss

I ran all three wired AFTV sticks on the d-link switch with WAN connected via LAN port from the Orbi. It ran solid for over 5 hours.

I tried to replicate the set-up as closely as possible on the Orbi, but since it only has 3 LAN ports, I could only run two wired devices and the HD box. All other devices were disconnected, including wifi. 

It ran fine for about an hour, then I tried to add wifi so I could stream another AFTV device, connect the d-link switch so I could connect a computer, then things started to go south. I had to reboot the router, which amazingly takes FOREVER to establish the internet conncection.

After multiple attempts at restarting the cable modem, restarting the router, reconnecting the satellites, I have given up. This is way too frustrating and time consuming. Luckily, I purchased my Orbi at Costco and they have a great return policy. It is going back today.

Thanks very much for your help along the way. I am very confident now that the HD box works and my network was running fine prior to switching to Orbi. While I may not have identified the exact issue with the Orbi system, I am pretty confident it is at the root of my issues.

It may work for others who have the time and patience to work with it, great for them, but I have never owned a system that requires so much care and attention ... don't have the time for it when there are other solutions out there that appear to be more reliable.