If you are experiencing this issue, follow the steps below:
Note: Before you proceed, ensure the Razer Phone is up to date.
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Play audio files stored in the Razer Phone and observe. If the issue no longer exists, this is due to slow internet connection.
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If the issue persists, go to "Settings" > "Connected Devices" > "Bluetooth".
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Select your Bluetooth headset or speaker and then select "forget the connection".

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Re-pair the device with your Bluetooth headset/speaker.
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If the issue persists, go to "Settings" > "Apps & Notifications".
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Select "Spotify". You may have to tap "See All" to locate Spotify.
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Tap "Data Usage" and enable "Background Data".

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Go to "Settings" > "Battery".
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Tap the 3 vertical buttons on the top-right of the screen and select "Battery optimization".

- Locate and tap "Spotify".
- Select "Don't optimize" and tap "DONE".

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Locate and tap "Bluetooth MIDI Service" and select "Don't Optimize".
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If the issue has not been resolved, boot into safe mode.
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If the issue still persists, factory data reset the Razer Phone.