One Orbi router RBR20 in the same house with one cable provider modem, 2 wifi networks

What FW is currently loaded?
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 them to begin with depending upon building materials.

Your not using any satellites with your system? 

 

Having two wifi networks can be problematic. 

The channels should be far appart between the two, Orbi on channel 11 on 2.4Ghz and EX on channel 1.