History for "Apps in Background not running"

I have 2 apps which very important for me... But those apps are stopping to provide their services each time I need them. The apps working just fine for a couple of times and then stopping to work till the next time I press on the app to access into the apps... It means that the apps are not running properly in the background...

Apps name :

Truecaller

Call recording

Please help me

Device:

Huawei Mate 10 Pro

Status:

open