RAX120 constantly dropping WiFi until reset

I have the RAX70 and was running fine for about 1 month up until about beginning of March. Then all of a sudden certain device lose wifi after a day or so and others are still OK and only way to get wifi back to those devices is to reboot router. It has happened to my cellphones and laptop but not my Amazon Echo's, HP printer, Direct TV receiver, or Samsung Smart TV as they continue to work just fine when this is happening.

Have been dealing with Netgear tech support for the last few days and nothing has been fixed, after many diffrent attempts, from multiple individuals and now waiting to hear back from them as 2 days has passed and were suppose to reach out to me already to send another router as this one is more than likely defective as everything they have tried does not work. Factory reset has been done multiple times, changed settings, changed modems 3 times with 2 diffrent types, was on latest update .88 and had me go back to .78 because supposedly after all else has been done, last yech said there are some known issues with the most current update being .88.