The Adaptive Battery feature is enabled by default on the LG smartphone, and for infrequently used apps, the activity in the background is limited, which is intended to extend battery life.

Android 9 | LG UX 9.0
Adaptive battery -  Open the  Settings
Adaptive battery -  Tap on  General
Adaptive battery -  Tap on  Battery
Adaptive battery -  Enable or Disable  Adaptive battery
  1. Open the Settings
  2. Tap on General
  3. Tap on Battery
  4. Enable or Disable Adaptive battery

LG Instructions
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