After reading all the comments and being absolutely fed up with getting kicked off of the Diamond Dynasty server. I went out and bought the NETGEAR NIGHTHAWK AC2600. Since I installed this router, I have not been kicked off Diamond Dynasty. I even signed in, played a game, and just left it connected while I went to work. When I got home 13+ hours later. I was still connected.
It seems that Walmart is the only one who sells them. With tax it came to $169.53 in NJ. With PS5 coming out soon. I think this was well worth the money and peace of mind.
I don't know why nobody else posted which Netgear Nighthawk router they bought because there is a whole bunch of them. It was really pissing me off trying to figure out which one I was supposed to buy.