Orbi RBK753S AX4200 - Nest Thermostat Battery Drain

Identical issue with my newly installed Orbi AX4200 system.  I have 3 Nest Gen 3 Thermostats that have worked fine for the past 3-4 years on my Xfinity Gateway.  Once I installed the Netgear Orbi AX4200 system, all three Nest Thermostats have experienced battery drain issues (not using a C wire on Thermostat) that results in them dropping Wifi connection.  All three were connected via 5GHZ channel.  I have since set up a separate wifi network using the older Xfinity Gateway’s 2.4GHZ channel with a different SSID to connect the 3 Nest Thermostats.  All 3 Thermostats are again working fine. Running two different WiFi networks in my house is really not ideal, but is the only way I could get the Nest Thermostats working correctly.  Would really like either Nest or Netgear to come up with a fix for this issue.