The Old Apple AirPort Extreme router finally died, and several internet reviews recommended the ASUS RT-AC88U which I selected.
User friendly setup wizard and graphical interface, and tons of wiz-bang features made installation a breeze. The wireless range is leaps and bounds better than the old router. Every part of the house and property (about 125' signal distance) locks in a strong signal now.
I don't know why the signal is so much better, but it has four antenna and a feature called "Beam Forming" that supposedly focuses the signal at the receiving devices. Whatever the reason, it just works.
If your WFi router is old with marginal signal coverage or bandwidth, consider a new router to fix the issue.