I have a Huawei phone and it kept doing this - it was very annoying.
Then I discovered it was because the screen was set to close down after 3 mins and that made the app shut down.
So what I did was go into the phone settings and just set the screen to have no limit and it fixed it! **
Obviously I'm not sure if this is what is happening to you (or it's a problem with the app) but it might be worth looking at your screen settings to see if it's the same issue?
**Don't forget to change it back again after your run or it might run your battery down very quickly
Actually just double checked how I did this and it is accessed via the Battery section on phone settings - you may have it on a Power Save option - if so take it off Power Save ( and that stops the screen being switched off and the app stopping).
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