Reset and setup from scatch on the XR router. Leave the EX OFF.
Try disabling Smart connect as well.
30 feet or more is recommended in between XR and EX📡 to begin with depending upon building materials when wirelessly connected.
Netgear has set up a community forum specifically for the NightHawk Gaming Router products. Most of the people who watch that forum are more likely to have experience with NH gaming router products and know how to work it better than those of us who follow this router forum. Might be more likely to find someone who has a solution if the question is posted there: https://community.netgear.com/t5/Nighthawk-Pro-Gaming-Routers/bd-p/en-home-nighthawk-pro-gaming-rout...
