Can route to host via wired, but not wireless

[trashpanda]

I'm running v2.3.5.30.  I have 2 NAS boxes in my house in 2 different locations.  They are both connected wired back to the Orbi router.  When I use a wireless device, I can easily get to one of the NAS boxes, but not the other.  If I connect an ethernet cable to my device, I can see either NAS box.  Any help on figuring out how to debug this issue would be greatly appreciated.

[CrimpOn]

How do you connect to the NAS box?

IP address or some sort of "name"?

Web browser?  Special software?

"Device" is?

[trashpanda]

The NAS box is a simple Synology NAS that I have configured with a fixed IP address configured in the orbi router static table.  When I can't see it... I can't connect via nfs or the web server configured on the box.  Ping tells me "request timeout" when I attempt to ping the static ip.  I turn off wifi and plug in a hard wired cable... and everything works.  Unplug the cable and turn wifi back on... can't find the ip.  This occurs from two different devices... though both of them are MacOS ( has occured across siera and catalina )...  Even when it can't see the NAS box... it can see the public network with no issue.