Orbi RBR50 5Ghz Stopped Working

FURRYe38 Thanks for the reply. I tried all of your suggestions. No change. 

To answer your questions and elaborate:

What Firmware version is currently loaded? 2.5.1.16
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too? AT&T Pace 5268ac

Has a factory reset and setup from scratch been performed since last FW update? Yes, several times.
Press the back reset button for 15 seconds then release.
Use a wifi analyzer on the Pad to see if there is a 5Ghz SSID signal need on the app...not sure what you meant. I used MacOS's Wireless Diagnostic scan tool. There are 14 networks around:  10 of them 2.4Ghz and 4 of them are 5.0 Ghz.  

What is the size of your home? Sq Ft? 2800 sqft
What is the distance between the router and satellite(s)? 30 feet is recommended in between RBR and RBS to begin with depending upon building materials when wirelessly connected. https://kb.netgear.com/000036466/How-far-should-I-place-my-Orbi-satellite-from-my-Orbi-router Yes the are 33 feet apart. The router is upstairs near staircase and satellite dowstairs diagonally. No direct field of sight but no wall either. Although that has nothing to do with the router itself not broadcasting 5Ghz client (5Ghz backhaul seems to be working fine).

What channels are you using? Auto? Try setting manual channel 1, 6 or 11 on 2.4Ghz and any unused channel on 5Ghz. Yes channel 11 for 2.4
Any Wifi Neighbors near by? If so, how many? There are 14 networks around:  10 of them 2.4Ghz and 4 of them are 5.0 Ghz.  

Try enabling Beamforming and MIMO(MIMO may or may not be needed) and WMM. Under Advanced Tab/Advanced Settings/Wireless Settings Yes, done so.

Try disabling the following and see:
Armor, Circle, Daisy Chain, Fast Roaming, IPv6 and Set 20/40Mhz Coexistence to 40Mhz only. Set Short preamble instead of Long preamble modes. Save settings and reboot the router and satellite(s). Yes, done so.

Any more suggestions?