In order to extend the battery life of their products, manufacturers destructively restrict apps background functions.
If the following error occurs frequently, it is probably caused by this reason.
App automatically closes during background playback
An error message shows: speech engine error or speech engine no response
After the screen is off, the speech is paused or intermittently
Please visit dontkillmyapp.com for solutions.
Or searching [your device model] + "allow app to run in background" in the search engine.
Note: You will need change the battery optimization setting to allow both the T2S app and speech engine app to run in the background.