Orbi RBR50 | AC3000 goes offline repeatedly for short periods

[InLV]

I have an Orbi RBR50 | AC3000 router that has worked fine since 2019. Beginning in February 2022 the router goes offline many times a day for several minutes (18 times yesterday). I receive notifications from my thermostats that they are not connected. If I check my router via the NG/Orbi app it shows the router offline. It usually remains offline for several minutes and all is good again. What is causing this to go offline constantly? Nothing has changed in the setup, physical or otherwise. No option for support via the Orbi app, everything is expired. Did something change in the firmware? Is this a faulty router?

Hardware Ver: RBR50

Firmware Ver: v2.7.3.22

[FURRYe38]

What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?

What is the size of your home? Sq Ft?
What is the distance between the router and 📡 satellite(s)? 30 feet or more is recommended in between RBR and RBS📡 to begin with depending upon building materials when wirelessly connected.
https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite 📡

What channels are you using? Auto? Try Auto and 48 on 5Ghz. Or try setting manual channel 1, 6 or 11 on 2.4Ghz and 40 to 48 channel on 5Ghz.
Any Wifi Neighbors near by? If so, how many?

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

Try disabling the following and see:
Armor, Circle, Traffic Meter, Daisy Chain, Fast Roaming, IPv6 and Set 20/40Mhz Coexistence to 40Mhz only. Set CTS to 2347. Set Short preamble instead of Long preamble modes. Save settings and reboot the router and satellite(s). Under Advanced Tab/Advanced Settings/Wireless Settings

One User Experience/Configuration:
https://community.netgear.com/t5/Orbi/Most-Stable-Orbi-Configuration/m-p/1941087/highlight/true#M970...