I still have hourly interruptions

What Firmware version is currently loaded?
What is the Mfr and model# of the Internet Service Providers modem/ONT the NG router is connected too? 
Be sure your using a good quality LAN cable between the modem and router. CAT6A STP is recommended. 

How many RBS are deployed? 
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 wired or wirelessly connected. 
https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite ‌‌🛰

RBS wireless or ethernet connected to the RBR. 

What brand and model devices do you have connected to the system? 

Where are you seeing this interruption with your devices? While connected to the RBR or to the RBS? 

How was the FW updated on the system? Via Auto Update or manually? 

Has a power off for 1 minute then back ON with the ISP modem and router and satellite(s) been performed since last update?
Be sure to restart your network in this sequence:
Turn off and unplug modem.
Turn off router and computers.
Plug in and turn on modem. Wait 2 minutes for it to connect.
Turn on the router and wait 2 minutes for it to connect.
Turn on computers and rest of network.

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

I've had my 770 series online since first getting v.5 FW. My system was manually updated OFFLINE, factory reset and setup from scratch and then put online. 
I've gamed with a xbox console wirelessly connected behind one of the RBS for over two hours with out seeing any issues or interuptions. 

Had zoom meeting for just over an hour wirelessly connected PC to the RBS with out seeing any interuptions.