Has a factory reset and setup from scratch been performed since last FW update?
Press the back reset button for 15 seconds then release.

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

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

Try enabling Beamforming and MIMO(MIMO may or maynot be needed) and WMM. Under Advanced Tab/Advanced Settings/Wireless Settings

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).

changds wrote:
We experienced the same thing. Our RBS50 satellite seemed to be the culprit and bring down the whole network for 5+ minutes while it rebooted. After multiple attempts at firmware changes, gave up. Bought the SRK60 Orbi Pro (which runs on different firmware) and has been stable for 8+ days so far.

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