Why Android Apps Pause in Background After Screen Lock: Key Causes Explained
Android apps that work flawlessly on-screen often fail to sync, fire timers, or deliver notifications once the phone is locked. This happens because locking the screen reduces an app's process priority, giving Android more freedom to restrict its background activity. Several mechanisms are involved, including Doze mode, App Standby buckets, background service limits introduced in Android 8.0, and CPU suspension when no wake lock is held. Developers often misread smooth foreground performance as proof that background tasks are reliable, when in fact those tasks lack a durable execution contract. Identifying which specific restriction is triggering the failure — rather than treating it as a single bug — is the key to diagnosing and fixing the problem.
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