My Netgear EX6400 won’t stay connected

I purchased the range extender and set it up using the Nighthawk app. It worked the first night and I haven’t been able to get it to stay connected since. I have done a factory rest, reset my router, gone through all the normal troubleshooting and I still can’t get it to work. The power light is solid green so is the WPA and the client. The router light is red. When I try to rerun the setup wizard it says it can not detect network NETGEAR_EXT. I have shut off anything that would interfere, security (VPN, etc), as well as cellular data so only WiFi is connected. Any advice would be appreciated!