Nighthawk Mesh WiFi 6 dropping problems

I have a Nighthawk Mesh WiFi 6 system M63.   It was installed about a month ago and worked very well for the first two weeks.  Since then, the satelites keep dropping computers (2.4) and the single printer (2.4).  It just dropped my iPhone.  I just added app and am not sure if its been dropping the phone before I added app.  I've gone through Netgear documentation and they don't even seem to include this problem in their troubleshooting section.  I can't find anything on their website either.  I notice that there are several mentions of similar problems posted in this forum.  I don't know whether all  devices are 2.4 - at least one iPhone is listed as 5.0 on app and I don't know if that is the one dropping.  The traffic meter and guest wifi are Off.  The Network Map shows the devices in series: Internet ...  MR60 router ... Satellite-2 ... Satellite-2.  When connected, the Internet Speed is indicated to be very fast.  I have no idea what firmware I am running and no idea how to check to find out.  Any suggestions will be greatly appreciated.  My wife is advocating that we replace this brand new system with another brand and I hate to waste the money spent on this system if it can be fixed.  I've never had problems with any of my previous Netgear products.  Many thanks