Orbi keeps rebooting several times a day even with new firmware V2.5.1.16

What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too?
Is the Orbi system operating in Router or AP mode?

What is the size of your home? Sq Ft?
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
https://kb.netgear.com/31030/What-do-the-LEDs-on-my-Orbi-mean

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

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).

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pshah wrote:
I have been having the exact same issue with this firmware version. Orbi reboots 6-7 times a day. I have done factory reset and still nothing. Very frustrating.

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If your unit is rebooting itself spontaneously, forget all the contortions and resetting and questioning your modem and house size. It's defective. It's what happened to me. There is a flaky component, one possibility is bad RAM, where memory data gets corrupted. 

Once I got a replacement router, it's been solid...so far.