Family member says their phone and tablet keep disconnecting from their home network. What should I be looking at while I debug this?

full image - Repost: Family member says their phone and tablet keep disconnecting from their home network. What should I be looking at while I debug this? (from Reddit.com, Family member says their phone and tablet keep disconnecting from their home network. What should I be looking at while I debug this?)

I'm going over their place to see if I can solve anything. Their router is the Verizon G3100 and they have Eero Mesh routers set up around the house. How would you go about debugging this issue? What should I be doing to rule out certain parts of the network?

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