My rbr50 and 4 satellites have stopped display 30 out of 40 connections. Any ideas why?

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?

Has a power off for 1 minute then back ON with the ISP modem and Orbi system been performed since last update?

Try a a factory reset and setup from scratch