Default Whatsapp voice messages

Hi guys,

I have been having issue on receiving my voice messages through speaker. However when I click the play button, the screen went blank (black) but just the back button to the conversation. The volumn of the message was so soft that I couldn't hear it. However, when I plugged in the headset, the message was played normally without screen went blank and everything. I hope someone can help me in this matter. Thanks.

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