RBR850 AX6000 System Startup Issues with DNS and browser refreshes

I am posting here because my problems and solution have ended up in a different discussion with a not obviously appropriate title.  After the usual startup problems, I was having a consistent problem with fairly frequent (at least a few times an hour) of not recognizing the Domain Name Server.  A refresh would always fix it. That is, my browser could not find the link I clicked on. After extensive discussions with Netgear and also on this foum, the router was replaced but did not resolve the problem.  However, beta version V223 did completely resolve the problem.   

My other problem was occasional  (hourly perhaps) incomplete browser pages. Usually some or all of the picture icons were missing. A refresh would always fix it.  I tried cutting down the MTU size, no joy. But someone here suggested I replace the modem. I have been on a new Spectrum modem for close to a week and no problems at all!!   The modem is curiously absent markings. Says Spectrum, and PC15 on the back.  My old Arris modem was quite old, maybe 5 years. I am running 200mbps speed.

Just want to thank the Netgear community for all their help.  Netgear was always ready to talk with me, but it took a combination of their help and help here to get me in good working order.  I will mark this as a solution when the app lets me do that.