Since no one has offered to help, I will. I have many of the devices you have, and also “upgraded” to the Nest Pro. I had nothing but problems, disconnections, and slow speeds with my fiber gigabit connection. I returned the Nest Pro and moved to a single TP-Link Wi-Fi 6E Router, however I will tell you that prior to the upgrade experience, I was running the previous Google Nest Router and had absolutely no problems with it. From your comments, I am assuming that you were using the ORIGINAL Google Mesh Wi-Fi system. I suggest that while you can, you return the Nest Pro system, and “downgrade” one step from that to the previous Nest Mesh hardware. Also, since you are trying the Nest Pro, I am assuming you don’t need one of the nodes to act as a smart speaker. Since in the previous iteration of the Nest Mesh, the “router” can also act as a mesh node, don’t buy the “two pack” or “three pack”…..those contain a “Router” and either two or three nodes that can act as a smart speaker. Those nodes’ speed is 1/2 the speed of the “router”, thus slowing down the entire system. Just buy one, two or three “routers”. They each have speeds of 2200 Mbps, then set up the single primary “router” and add the additional routers as mesh nodes. An additional advantage to this is that each of the router hardware units has two Ethernet ports that can be used as you desire. Finally, the system as I have described it will be cheaper than what you spent for the Nest Pro, and I believe you would be very happy with it.
