How to make sure an app keep running in background on Redmi Note 5?

You can try the following methods to ensure an app is always running in the background:

Step 1:
1. From the device’s Settings, go to Battery & performance.
2. Turn off Scenes > Sleep mode.
3. Tap Choose apps, select an app and then select ‘No restrictions’ for not allowing battery saver to restrict this app’s activity.

Step 2:
1. Open the Security app, tap Boost speed > Settings button > Lock apps.
2. Turn on the switch next to the app you want to lock.

Step 3:
1. Open the recent app view (by pressing Recent apps square button), then swipe down the thumbnail of the app you want to lock in background.