RBR50 Drops WiFi Roughly Every 6 Days

What is the Mfr and model# of the ISP modem 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 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 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).

This isn't a FW issue. More like a interference issue or configuration issue.

Has a factory reset and setup from scratch been performed since last FW update? 

Also there is newer v16 FW available as well to try...

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edthesprinter wrote:

Hi,

About every 6 days, my ORBI RBR50 WiFi stops. I have to reboot to get things going again. Anyone else having the same issue? Firmware version is V2.5.1.8

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here's your problem.........Firmware version is V2.5.1.8

get rid of it