Nighthawk Mesh 6 wifi dropping macbooks only, can't reconnect - windows not a problem

Just to add a little more detail... I was on my windows machine next to the missus using her mac.  All of a sudden she was dropped, I was not.  I "forgot" the network on her mac and reconnected with fresh password request.  It connects to modem, but then gives the "can't connect to internet error".  Haven't been able to connect since.  ALSO - exact same thing happens on another macbook my daughter uses - sometimes magically connects, sometimes will never connect, with same IP address error.