Adding 2nd satellite brings down network intermittently

The bottom line is that with two satellites connected directly to the Orbi router by WIRE (and even by WiFi as I found during an accidental test by WIFI when I left a wire disconnected), when both satellites are turned on, when one is showing good the other is showing config sync or disconnected.  If I turn off the first one the second one  shows good.  If I turn off the second one, the first one shows good.  The Orbi router does not work with two satellites at the same time.  And I've tried it with 2 different Orbi routers and 3 different satellites.  I don't think the size of the house is relevant but it is about 5000 square feet and each Orbi is on a different floor and we are talking mostly wired testing.  And yes I tried factory resets of the routers and satellites and all are running same latest firmware that Netgear posted.

I have to wonder, how many people own two Orbi satellites and don't know that one isn't working because they never look at the app or the Orbi web site.

I never had this problem when using the Orbi router as an Access point instead of as a router.  (Google Fiber replaced their modem/routers with modems last September.)  I also was using an Orbi router as an access point for a while instead of a using a second satellite.  Didn't have a problem then either.  Problem is using two satellites.  Doesn't work.