Try deleting the App from the phone and reinstalling. I assume that you tried turning off both your phone and router and then restarted both
Now What?
I added an NAD CS1 to my inventory a few weeks ago and have been learning the idiosynchrosies (sic) in using it. I just replaced my IP's modem/router with a Surfboard and a switch. Now the CS1 does not show up on my phone, so I can't connect to it. I'm guessing it has something to do with not being recognized by the new modem/router?