Are the RBS ethernet connected to the back of the RBR or the ISP modem?

Are the RBS using the 1Gb LAN ports in back or the one 2.5Gb LAN port when ethernet connected? 

Users have reported having issues with v.31. So we've been recommending users downgrade the RBS first, the RBR lastly back to v.21 if your in the USA region:

https://community.netgear.com/t5/Orbi-WIFI-6-AX-AND-Wi-Fi-6E-AXE/New-RBRE960-RBSE960-Firmware-Version-7-2-6-21-Released/m-p/2333935/highlight/true#M47328

This the most stable version of FW for the AX and AXE series. 

You'll need to factory reset and setup from scratch after getting the system downgraded. I recommend using the following PDF process to do it. Works well:

https://community.netgear.com/t5/Orbi-WIFI-6-AX-AND-Wi-Fi-6E-AXE/Procedure-for-Factory-reset-of-RBS850/m-p/2356834/highlight/true#M52575

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MrcleanMC wrote:

I have an Orbi 963 one router and I'm using 3 sats across about 7000 sq feet and 4 floors.

Located in the US

V7.2.6.31_5.0.24

All wired with Cat8 Ethernet cable

Using my own ARRIS Surfboard DOCSIS 3.1 Multi-Gigabit Cable Modem with 2.5 Gbps Ethernet Port instead of my ISPs modem.

All wired satellites are more than 30' from modem and each other

 

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