I just wanted to jump in real fast to see if you saw PatrickP_Viking's reply and to see if you still needed some help on this or if you were able to get it sorted out. If you are still needing some help, just let us know and we'll be happy to continue helping.
The factory reset for each of the 4 devices went without a hitch. What I didn't realize was that I would have to reset all my wifi plugs and switches too. I have a total of about 30 devices on my wifi system. Of course, not all are the plugs and switches. It turned out to be more time consuming than I had planned.
Thanks for the update. I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.
The factory reset went well. But, my coverage did not improve. I have "had it" with these Google Nest WiFi routers. I have four selectively placed in my 3000 square foot home. I've been using them for 4 years. They have never worked seemlessly. I just can not rely on them. They require lots of tweaking and rebooting. I'm going to look for another system.
I’m sorry to hear that you’re still experiencing issues. For a 4,000 sq. ft. home, normally just 1 Nest Wifi router and a Nest Wifi point should be enough. It also depends on the kind of home that you have. You can read more about it here. Try turning off some points and place the points within line of sight of each other. You can also try the steps in this article to improve your network’s speed. Let us know how it goes.