If the application has been running for a while, but then stops, check the message history. You can do this by clicking on the filter name:
If the history list contains those SMS that should be sent, then go to the next article.
If there are no necessary SMS in the history list, then this means that the background operation of the application did not work, which adds them to the history and sends them as intended. This could happen for several reasons:
1) The operating system of your phone has disabled the application in the background (for example, with a low battery, this could happen). To prevent the application from stopping when the battery is low, go to your phone’s settings, go to the application list and find the application there.
Check options such as Battery Optimization, Autostart, and Internet traffic. There should be no restrictions. (You can find a detailed manual on the Internet for your phone model).
2) You have disabled the display of a permanent notification in the status bar. For stable operation, you need to enable it and make sure that at the time of receipt of SMS this notification appears.
