Router Dropping Internet Connection Constantly

Unfortunately, many people are having bad experiences with their systems.

Firmware is V2.2.1.210 on both the router and satellites

The ISP modem is Arris TG1672G  (w/static IP)

The Router is a NG ProSafe FVS336G

The Orbi is in AP mode (I have tried Router mode as well)

DHCP is being managed by the router and not Orbi.

I have tried reserving an IP for the Orbis

My home is +/- 4,500 Sq,.Ft.

I have the router and a satelllite on the main floor 20 - 30 feet apart (I have moved them all over the place, they are now are at about 20 feet).  The second satallite is on the second floor about 10 feet away from the router and one floor above.

I have tried channel 44 & 48 & Auto, 6 & 11.

My nearest neighbor is about 1/2 mile away

I have tried WPA2-PSK [AES], WPA-PSK [TKIP] + WPA2-PSK [AES] and No security

I have tried Beamforming and MIMO.

I have also tried enabling/disabling Daisy Chain, Fast Roaming, and  20/40Mhz Coexistence to 40Mhz only. 

I also tried reducing the CTD/RTS threshold (per NG support)

I have also tried lowering the transmit power to 75%

Each time I make a change I have rebooted my router, modem and Orbi.  Sometimes it has been stable for several hours after I have reset everything.

I do not have any connectivity issues with the hard wired devices.

It also seems that the desktop computer plugged into the Orbi does not lose it's connection to the internet, even when the GUI shows disconnected.