This is a common problem with phone manufacturer battery savers' turning off apps running in the background. It happens when the screen turns off or the app is put in the background. There are workarounds to this common problem. A resource to help you stop your phone from killing the Music Speed Changer app (and other apps you want to run in the background) is Don't kill my app:
https://dontkillmyapp.com/
(We are not affiliated with Don't kill my app, just have found the advice helpful for our users)
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