Silent alarm goes off with a sound
- Battery optimization has been enabled
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When battery optimization is enabled, vibrations do not work, so the app loads the built-in ringtone to make sure you 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.
- Phone has been restarted
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If the phone screen is locked after a restart, the app cannot load any files.
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The phone will ring with the built-in ringtone and vibrate.
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Tags: alarm, ringtone