On your iPhone 8 Plus, go to Settings-> Privacy-> Diagnostics and Usage-> Diagnostics and Data to view and access this menu.
On the following screen, you'll notice a slew of programs and data logs. Examine which apps appear more frequently, such as 10 to 20 times each day. If you see any app with the aforementioned frequency logs, that app is most likely to blame. you can try clearing disable or uninstall the app from your device completely.