Strong signal with this hardware and it has not dropped connection once yet

With this new router, I'm getting strong signal on the 3rd floor and my nest cam hasn't gone off-line since I switched over about 3 weeks ago.

Even though this is a much more expensive and fancier router, it still has the same problems providing a strong wifi signal throughout my home that I had with my original older cheaper router

With my first router - much cheaper than this one - I had trouble getting a strong WiFi signal (or any signal) in some corners of my house (it’s not a big house, but it’s 3 stories)

Signal is strong all around the house

It had trouble reaching the 3rd floor of my house with reliable signal.