Silent alarm goes off with a sound
- Battery optimization was enabled
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When battery optimization is enabled, vibrations do not work, so the app is loading the built-in ringtone to ensure your wake up.
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Check Settings → Sleep tracking → Battery optimized.
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Do not enable Save battery option from the Tracking screen → Stop and save pull up menu → Save battery.
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- Phone was rebooted
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When the phone screen is locked after a reboot, the app cannot load any files.
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The phone rings with the build-in ringtone and vibrates.
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Tags: alarm, ringtone