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Once I determined that my ISP's service was fine (meaning, it was an issue with my wi-fi within my house, not the internet service coming to my house), here's what I did to make it work well for my two-story house.

I bought a wi-fi mesh unit with 4 nodes. I also bought a network bridge. Here's now it's set up:

1. From the cable modem box I connect an Ethernet cable to the parent node of the wi-fi mesh unit.

2. From the parent node I connect to the network bridge box.

3. From the bridge box I run 3 Ethernet cables throughout the house and connect a wi-fi node to each one. Combined with the parent node, I have to nodes upstairs and two nodes downstairs, fairly evenly spread out on each floor.

This allows us to connect with a device from anywhere in the house to one wi-fi name without caring which node our phone/laptop is connected to. Because the nodes are connected together with Ethernet cables, there's no interference from items in the walls or between floors to interfere with the radio signal. Wherever I'm at in the house, there's a wi-fi node near me without much in between us to interfere with the signal. Also, if multiple devices are connected to the wi-fi, you may wind up connected to a node 2nd nearest to you if someone else (or another device) is hogging up the bandwidth to the node nearest you.