Custom Control was working, now isn't

I wrote a Custom Control app a year or two ago that has worked fine. But it suddenly has quit working. The app will come up on the phone and show the controls, but operating them changes nothing on the board. Also, the smart labels for each control that should populate on app, from the channel names on the board; are empty. So the app is there. It can be pulled up, but wont operate channels. I did re-upload it to the console, no improvement. Also power toggles of the WAP and board didn’t help. I have not recently updated any firmware. Thanks for any ideas.

Replying to say, I got it fixed. Since I only run one console (Avantis) I deleted the keyring password, and changed the Singer password. Singers log in to the app with the username of Singer. This corrected the problem.