RBK753S AX4200 WiFi 6 Mesh System dropping connection when moving around house

The key phrase is "dropped from WiFi", which I agree should not happen.

Found a fascinating discussion of Pixel 6 roaming which recommended reducing the access point power level:https://www.reddit.com/r/Pixel6/comments/qii14b/pixel_6_and_fast_roaming/ 

1. If this also happens to other devices, then this article may not be helpful, and
2. Their issue was "failure to roam", rather than lose WiFi completely.

In other words, "I got no idea."  It is unclear (to me) whether the issue is with the Orbi system, those devices, or how they interact.  Anyway, I would continue to search for information about Pixel 6 and WiFi roaming.

As a tip, however, at some point the topic of rebooting the system will come up.  Since the first IBM PC (1982?), when strange things happen, one tactic is to "turn the damn thing off and back on again."

The last resort, of course, is to do a Factory Reset on the router.

I do a Factory Reset in two steps: (1) quick, and (2) thorough

After reset, the User Name is "admin" and password is "password"

For a quick reset, save a copy of the configuration to a file on the computer.

Press something into the "Reset" hole until the power LED turns amber and begins to flash, then pull it out.

When the router boots up, go through the setup steps on the web interface, ignoring every attempt to enter anything* until you get to a page offering two choices:

1. Restore a saved configuration.
2. Set up the router manually.

At that point, load the saved config and the router will reboot. When it comes up, every device will reconnect as before.

Total time: 10-15 minutes.

If this solves the issue, you are done.

* do not set up the SSID/password, register the product (again), sign up for Armor, Parental Controls... nothing.

If this did not solve the issue, the only recourse is the thorough reset by hand.  During this step, again do not change the SSID/password until everything you want to customize has been done.  Once the SSID/password that every device in the house knows about appears, they will all rush to connect and will get assigned whatever IP comes up next in the list. Once you are all done, change the SSID/password, and off you go.