If you start the Anchor Alert App connected to the DataHub, and the Anchor Alert process starts on the DataHub it will run regardless of the app state. If the app is losing the active session you might be force closing the app instead of dropping it into the background.
To keep the Anchor Alert App pro session running on your phone/iPad please press the home button, or use a quick swipe up to drop the app into the background. This will maintain the session for when you next open the app.
If you drag up on the bottom of the middle of the screen, and then swipe up, this will force close the app and you will lose the active alert session.